251222122002 has 16 divisors (see below), whose sum is σ = 502450536672. Its totient is φ = 83739658560.

The previous prime is 251222121979. The next prime is 251222122111. The reversal of 251222122002 is 200221222152.

It is a super-2 number, since 2×251222122002² (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 251222122002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376477 + ... + 802607.

It is an arithmetic number, because the mean of its divisors is an integer number (31403158542).

Almost surely, 2^251222122002 is an apocalyptic number.

251222122002 is an abundant number, since it is smaller than the sum of its proper divisors (251228414670).

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

251222122002 is a wasteful number, since it uses less digits than its factorization.

251222122002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524393.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 251222122002 its reverse (200221222152), we get a palindrome (451443344154).

The spelling of 251222122002 in words is "two hundred fifty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two".