21110242131 has 18 divisors (see below), whose sum is σ = 33516630420. Its totient is φ = 12794085480.

The previous prime is 21110242129. The next prime is 21110242141. The reversal of 21110242131 is 13124201112.

21110242131 is a `hidden beast` number, since 211 + 1 + 0 + 2 + 421 + 31 = 666.

It is not a de Polignac number, because 21110242131 - 2¹ = 21110242129 is a prime.

It is a super-2 number, since 2×21110242131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110242141) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9691401 + ... + 9693578.

Almost surely, 2^21110242131 is an apocalyptic number.

21110242131 is a deficient number, since it is larger than the sum of its proper divisors (12406388289).

21110242131 is a wasteful number, since it uses less digits than its factorization.

21110242131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385007 (or 19384993 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21110242131 its reverse (13124201112), we get a palindrome (34234443243).

The spelling of 21110242131 in words is "twenty-one billion, one hundred ten million, two hundred forty-two thousand, one hundred thirty-one".