251121405332 has 48 divisors (see below), whose sum is σ = 503286981120. Its totient is φ = 107399907552.

The previous prime is 251121405317. The next prime is 251121405347. The reversal of 251121405332 is 233504121152.

It is an interprime number because it is at equal distance from previous prime (251121405317) and next prime (251121405347).

It is a junction number, because it is equal to n+sod(n) for n = 251121405295 and 251121405304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52456643 + ... + 52461429.

It is an arithmetic number, because the mean of its divisors is an integer number (10485145440).

Almost surely, 2^251121405332 is an apocalyptic number.

It is an amenable number.

251121405332 is an abundant number, since it is smaller than the sum of its proper divisors (252165575788).

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

251121405332 is a wasteful number, since it uses less digits than its factorization.

251121405332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300 (or 8298 counting only the distinct ones).

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

Adding to 251121405332 its reverse (233504121152), we get a palindrome (484625526484).

The spelling of 251121405332 in words is "two hundred fifty-one billion, one hundred twenty-one million, four hundred five thousand, three hundred thirty-two".