251220331403312 has 40 divisors (see below), whose sum is σ = 529300070279136. Its totient is φ = 115026161273856.

The previous prime is 251220331403309. The next prime is 251220331403323. The reversal of 251220331403312 is 213304133022152.

It is a super-2 number, since 2×251220331403312² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12481127228 + ... + 12481147355.

Almost surely, 2^{251220331403312} is an apocalyptic number.

It is an amenable number.

251220331403312 is an abundant number, since it is smaller than the sum of its proper divisors (278079738875824).

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

251220331403312 is a wasteful number, since it uses less digits than its factorization.

251220331403312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24962274645 (or 24962274639 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 251220331403312 its reverse (213304133022152), we get a palindrome (464524464425464).

The spelling of 251220331403312 in words is "two hundred fifty-one trillion, two hundred twenty billion, three hundred thirty-one million, four hundred three thousand, three hundred twelve".