1222212220 has 48 divisors (see below), whose sum is σ = 2637679968. Its totient is φ = 475453440.

The previous prime is 1222212217. The next prime is 1222212223. The reversal of 1222212220 is 222122221.

It is an interprime number because it is at equal distance from previous prime (1222212217) and next prime (1222212223).

It is a junction number, because it is equal to n+sod(n) for n = 1222212194 and 1222212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222212223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204312 + ... + 210208.

It is an arithmetic number, because the mean of its divisors is an integer number (54951666).

Almost surely, 2^1222212220 is an apocalyptic number.

1222212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1318839984).

1222212220 is an abundant number, since it is smaller than the sum of its proper divisors (1415467748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222212220 is a wasteful number, since it uses less digits than its factorization.

1222212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190 (or 6188 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1222212220 is about 34960.1518875419. The cubic root of 1222212220 is about 1069.1751934024.

Adding to 1222212220 its reverse (222122221), we get a palindrome (1444334441).

It can be divided in two parts, 12222 and 12220, that added together give a palindrome (24442).

The spelling of 1222212220 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty".