12345021056 has 32 divisors (see below), whose sum is σ = 24940003680. Its totient is φ = 6085569280.

The previous prime is 12345021037. The next prime is 12345021061. The reversal of 12345021056 is 65012054321.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670106 + ... + 688281.

It is an arithmetic number, because the mean of its divisors is an integer number (779375115).

Almost surely, 2^12345021056 is an apocalyptic number.

12345021056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12345021056 is an abundant number, since it is smaller than the sum of its proper divisors (12594982624).

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

12345021056 is an equidigital number, since it uses as much as digits as its factorization.

12345021056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358472 (or 1358460 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 12345021056 its reverse (65012054321), we get a palindrome (77357075377).

The spelling of 12345021056 in words is "twelve billion, three hundred forty-five million, twenty-one thousand, fifty-six".