21531012312150 has 96 divisors (see below), whose sum is σ = 64723527964800. Its totient is φ = 5219639344800.

The previous prime is 21531012312149. The next prime is 21531012312167. The reversal of 21531012312150 is 5121321013512.

21531012312150 is a `hidden beast` number, since 2 + 1 + 531 + 0 + 1 + 2 + 3 + 121 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 724935060 + ... + 724964759.

It is an arithmetic number, because the mean of its divisors is an integer number (674203416300).

Almost surely, 2^{21531012312150} is an apocalyptic number.

21531012312150 is an abundant number, since it is smaller than the sum of its proper divisors (43192515652650).

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

21531012312150 is a wasteful number, since it uses less digits than its factorization.

21531012312150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449899851 (or 1449899840 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

Adding to 21531012312150 its reverse (5121321013512), we get a palindrome (26652333325662).

The spelling of 21531012312150 in words is "twenty-one trillion, five hundred thirty-one billion, twelve million, three hundred twelve thousand, one hundred fifty".