21610454031 has 6 divisors (see below), whose sum is σ = 31215100280. Its totient is φ = 14406969348.

The previous prime is 21610453981. The next prime is 21610454053. The reversal of 21610454031 is 13045401612.

It is a happy number.

21610454031 is a `hidden beast` number, since 2 + 1 + 610 + 4 + 5 + 40 + 3 + 1 = 666.

It is not a de Polignac number, because 21610454031 - 2⁶ = 21610453967 is a prime.

It is a super-2 number, since 2×21610454031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21610453986 and 21610454004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610454081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1200580771 + ... + 1200580788.

Almost surely, 2^21610454031 is an apocalyptic number.

21610454031 is a deficient number, since it is larger than the sum of its proper divisors (9604646249).

21610454031 is a wasteful number, since it uses less digits than its factorization.

21610454031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401161565 (or 2401161562 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 21610454031 its reverse (13045401612), we get a palindrome (34655855643).

The spelling of 21610454031 in words is "twenty-one billion, six hundred ten million, four hundred fifty-four thousand, thirty-one".