1256551021232 has 40 divisors (see below), whose sum is σ = 2621911863984. Its totient is φ = 579931179264.

The previous prime is 1256551021223. The next prime is 1256551021249. The reversal of 1256551021232 is 2321201556521.

It is a happy number.

It is a super-2 number, since 2×1256551021232² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1256551021192 and 1256551021201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12365543 + ... + 12466745.

Almost surely, 2^{1256551021232} is an apocalyptic number.

It is an amenable number.

1256551021232 is an abundant number, since it is smaller than the sum of its proper divisors (1365360842752).

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

1256551021232 is a wasteful number, since it uses less digits than its factorization.

1256551021232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160917 (or 160911 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 1256551021232 its reverse (2321201556521), we get a palindrome (3577752577753).

The spelling of 1256551021232 in words is "one trillion, two hundred fifty-six billion, five hundred fifty-one million, twenty-one thousand, two hundred thirty-two".