251321231213423 has 16 divisors (see below), whose sum is σ = 304038515489280. Its totient is φ = 203153008062816.

The previous prime is 251321231213419. The next prime is 251321231213431. The reversal of 251321231213423 is 324312132123152.

It is not a de Polignac number, because 251321231213423 - 2² = 251321231213419 is a prime.

It is a super-2 number, since 2×251321231213423² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251321231213443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 14395754315 + ... + 14395771772.

It is an arithmetic number, because the mean of its divisors is an integer number (19002407218080).

Almost surely, 2^{251321231213423} is an apocalyptic number.

251321231213423 is a deficient number, since it is larger than the sum of its proper divisors (52717284275857).

251321231213423 is a wasteful number, since it uses less digits than its factorization.

251321231213423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28791526166.

The product of its digits is 51840, while the sum is 35.

Adding to 251321231213423 its reverse (324312132123152), we get a palindrome (575633363336575).

The spelling of 251321231213423 in words is "two hundred fifty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thirteen thousand, four hundred twenty-three".