1222257220 has 24 divisors (see below), whose sum is σ = 2574508608. Its totient is φ = 487423200.

The previous prime is 1222257209. The next prime is 1222257247. The reversal of 1222257220 is 227522221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85696 + ... + 98935.

It is an arithmetic number, because the mean of its divisors is an integer number (107271192).

Almost surely, 2^1222257220 is an apocalyptic number.

1222257220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222257220 is an abundant number, since it is smaller than the sum of its proper divisors (1352251388).

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

1222257220 is a wasteful number, since it uses less digits than its factorization.

1222257220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184971 (or 184969 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 1222257220 is about 34960.7954714992. The cubic root of 1222257220 is about 1069.1883150443.

Adding to 1222257220 its reverse (227522221), we get a palindrome (1449779441).

The spelling of 1222257220 in words is "one billion, two hundred twenty-two million, two hundred fifty-seven thousand, two hundred twenty".