1321042056 has 16 divisors (see below), whose sum is σ = 3302605200. Its totient is φ = 440347344.

The previous prime is 1321042033. The next prime is 1321042057. The reversal of 1321042056 is 6502401231.

It is a super-2 number, since 2×1321042056² = 3490304227441414272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 55043419 = 1321042056 / (1 + 3 + 2 + 1 + 0 + 4 + 2 + 0 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (1321042057) 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 3 ways as a sum of consecutive naturals, for example, 27521686 + ... + 27521733.

It is an arithmetic number, because the mean of its divisors is an integer number (206412825).

Almost surely, 2^1321042056 is an apocalyptic number.

It is an amenable number.

1321042056 is an abundant number, since it is smaller than the sum of its proper divisors (1981563144).

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

1321042056 is a wasteful number, since it uses less digits than its factorization.

1321042056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55043428 (or 55043424 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1321042056 is about 36346.1422437100. The cubic root of 1321042056 is about 1097.2498949428.

Adding to 1321042056 its reverse (6502401231), we get a palindrome (7823443287).

The spelling of 1321042056 in words is "one billion, three hundred twenty-one million, forty-two thousand, fifty-six".