251231421455412 has 24 divisors (see below), whose sum is σ = 586207238502816. Its totient is φ = 83743723088928.

The previous prime is 251231421455407. The next prime is 251231421455437. The reversal of 251231421455412 is 214554124132152.

It is a congruent number.

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, 2598603 + ... + 22565805.

It is an arithmetic number, because the mean of its divisors is an integer number (24425301604284).

Almost surely, 2^{251231421455412} is an apocalyptic number.

It is an amenable number.

251231421455412 is an abundant number, since it is smaller than the sum of its proper divisors (334975817047404).

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

251231421455412 is a wasteful number, since it uses less digits than its factorization.

251231421455412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21015727 (or 21015725 counting only the distinct ones).

The product of its digits is 384000, while the sum is 42.

Adding to 251231421455412 its reverse (214554124132152), we get a palindrome (465785545587564).

The spelling of 251231421455412 in words is "two hundred fifty-one trillion, two hundred thirty-one billion, four hundred twenty-one million, four hundred fifty-five thousand, four hundred twelve".