21115321431124 has 24 divisors (see below), whose sum is σ = 38284558570496. Its totient is φ = 10179389556000.

The previous prime is 21115321431101. The next prime is 21115321431151. The reversal of 21115321431124 is 42113412351112.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 314145087 + ... + 314212294.

Almost surely, 2^{21115321431124} is an apocalyptic number.

It is an amenable number.

21115321431124 is a deficient number, since it is larger than the sum of its proper divisors (17169237139372).

21115321431124 is a wasteful number, since it uses less digits than its factorization.

21115321431124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628357687 (or 628357685 counting only the distinct ones).

The product of its digits is 5760, while the sum is 31.

Adding to 21115321431124 its reverse (42113412351112), we get a palindrome (63228733782236).

The spelling of 21115321431124 in words is "twenty-one trillion, one hundred fifteen billion, three hundred twenty-one million, four hundred thirty-one thousand, one hundred twenty-four".