251121141012 has 48 divisors (see below), whose sum is σ = 671090434560. Its totient is φ = 71595248352.

The previous prime is 251121140999. The next prime is 251121141023. The reversal of 251121141012 is 210141121152.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 251121141012.

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, 3161562 + ... + 3240017.

It is an arithmetic number, because the mean of its divisors is an integer number (13981050720).

Almost surely, 2^251121141012 is an apocalyptic number.

It is an amenable number.

251121141012 is an abundant number, since it is smaller than the sum of its proper divisors (419969293548).

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

251121141012 is a wasteful number, since it uses less digits than its factorization.

251121141012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402060 (or 6402058 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 21.

Adding to 251121141012 its reverse (210141121152), we get a palindrome (461262262164).

The spelling of 251121141012 in words is "two hundred fifty-one billion, one hundred twenty-one million, one hundred forty-one thousand, twelve".