251231021332 has 12 divisors (see below), whose sum is σ = 458769691296. Its totient is φ = 120153966680.

The previous prime is 251231021303. The next prime is 251231021339. The reversal of 251231021332 is 233120132152.

251231021332 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 251231021297 and 251231021306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251231021339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365385894 + ... + 1365386077.

It is an arithmetic number, because the mean of its divisors is an integer number (38230807608).

Almost surely, 2^251231021332 is an apocalyptic number.

It is an amenable number.

251231021332 is a deficient number, since it is larger than the sum of its proper divisors (207538669964).

251231021332 is a wasteful number, since it uses less digits than its factorization.

251231021332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730771998 (or 2730771996 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 251231021332 its reverse (233120132152), we get a palindrome (484351153484).

The spelling of 251231021332 in words is "two hundred fifty-one billion, two hundred thirty-one million, twenty-one thousand, three hundred thirty-two".