1222353220 has 72 divisors (see below), whose sum is σ = 2955633408. Its totient is φ = 421070400.

The previous prime is 1222353211. The next prime is 1222353229. The reversal of 1222353220 is 223532221.

It is an interprime number because it is at equal distance from previous prime (1222353211) and next prime (1222353229).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1222353191 and 1222353200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222353229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71725 + ... + 87115.

It is an arithmetic number, because the mean of its divisors is an integer number (41050464).

Almost surely, 2^1222353220 is an apocalyptic number.

1222353220 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 1222353220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477816704).

1222353220 is an abundant number, since it is smaller than the sum of its proper divisors (1733280188).

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

1222353220 is a wasteful number, since it uses less digits than its factorization.

1222353220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15449 (or 15428 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 1222353220 is about 34962.1684110125. The cubic root of 1222353220 is about 1069.2163068039.

Adding to 1222353220 its reverse (223532221), we get a palindrome (1445885441).

The spelling of 1222353220 in words is "one billion, two hundred twenty-two million, three hundred fifty-three thousand, two hundred twenty".