21631615247125 has 16 divisors (see below), whose sum is σ = 29072890894320. Its totient is φ = 15974115873600.

The previous prime is 21631615247113. The next prime is 21631615247191. The reversal of 21631615247125 is 52174251613612.

It can be written as a sum of positive squares in 8 ways, for example, as 18589601372356 + 3042013874769 = 4311566^2 + 1744137^2 .

It is not a de Polignac number, because 21631615247125 - 2⁹ = 21631615246613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6655879990 + ... + 6655883239.

It is an arithmetic number, because the mean of its divisors is an integer number (1817055680895).

Almost surely, 2^{21631615247125} is an apocalyptic number.

21631615247125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21631615247125 is a deficient number, since it is larger than the sum of its proper divisors (7441275647195).

21631615247125 is a wasteful number, since it uses less digits than its factorization.

21631615247125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13311763257 (or 13311763247 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The spelling of 21631615247125 in words is "twenty-one trillion, six hundred thirty-one billion, six hundred fifteen million, two hundred forty-seven thousand, one hundred twenty-five".