1222122220 has 48 divisors (see below), whose sum is σ = 2827542816. Its totient is φ = 440000000.

The previous prime is 1222122217. The next prime is 1222122229. The reversal of 1222122220 is 222212221.

It is a junction number, because it is equal to n+sod(n) for n = 1222122194 and 1222122203.

It is not an unprimeable number, because it can be changed into a prime (1222122229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5281 + ... + 49720.

It is an arithmetic number, because the mean of its divisors is an integer number (58907142).

Almost surely, 2^1222122220 is an apocalyptic number.

1222122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222122220 is an abundant number, since it is smaller than the sum of its proper divisors (1605420596).

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

1222122220 is a wasteful number, since it uses less digits than its factorization.

1222122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55122 (or 55120 counting only the distinct ones).

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

The square root of 1222122220 is about 34958.8646840826. The cubic root of 1222122220 is about 1069.1489491523.

Adding to 1222122220 its reverse (222212221), we get a palindrome (1444334441).

Subtracting from 1222122220 its reverse (222212221), we obtain a palindrome (999909999).

The spelling of 1222122220 in words is "one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty".