251201022112 has 24 divisors (see below), whose sum is σ = 494593816500. Its totient is φ = 125589894144.

The previous prime is 251201022101. The next prime is 251201022157. The reversal of 251201022112 is 211220102152.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 239242287376 + 11958734736 = 489124^2 + 109356^2 .

It is a super-2 number, since 2×251201022112² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251201022112.

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, 59814 + ... + 711322.

Almost surely, 2^251201022112 is an apocalyptic number.

It is an amenable number.

251201022112 is a deficient number, since it is larger than the sum of its proper divisors (243392794388).

251201022112 is a wasteful number, since it uses less digits than its factorization.

251201022112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663568 (or 663560 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 251201022112 its reverse (211220102152), we get a palindrome (462421124264).

The spelling of 251201022112 in words is "two hundred fifty-one billion, two hundred one million, twenty-two thousand, one hundred twelve".