21056023031 has 8 divisors (see below), whose sum is σ = 21298451280. Its totient is φ = 20814579072.

The previous prime is 21056022997. The next prime is 21056023103. The reversal of 21056023031 is 13032065012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21056023031 - 2¹⁰ = 21056022007 is a prime.

It is a super-2 number, since 2×21056023031² (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 = 21056022988 and 21056023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21056023531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203000 + ... + 288653.

It is an arithmetic number, because the mean of its divisors is an integer number (2662306410).

Almost surely, 2^21056023031 is an apocalyptic number.

21056023031 is a deficient number, since it is larger than the sum of its proper divisors (242428249).

21056023031 is a wasteful number, since it uses less digits than its factorization.

21056023031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492145.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21056023031 its reverse (13032065012), we get a palindrome (34088088043).

The spelling of 21056023031 in words is "twenty-one billion, fifty-six million, twenty-three thousand, thirty-one".