251321231213420 has 12 divisors (see below), whose sum is σ = 527774585548224. Its totient is φ = 100528492485360.

The previous prime is 251321231213419. The next prime is 251321231213431. The reversal of 251321231213420 is 24312132123152.

It is a super-3 number, since 3×251321231213420³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 6283030780316 + ... + 6283030780355.

It is an arithmetic number, because the mean of its divisors is an integer number (43981215462352).

Almost surely, 2^{251321231213420} is an apocalyptic number.

251321231213420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251321231213420 is an abundant number, since it is smaller than the sum of its proper divisors (276453354334804).

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

251321231213420 is a wasteful number, since it uses less digits than its factorization.

251321231213420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12566061560680 (or 12566061560678 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 251321231213420 its reverse (24312132123152), we get a palindrome (275633363336572).

The spelling of 251321231213420 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".