21112023031 has 32 divisors (see below), whose sum is σ = 24596877312. Its totient is φ = 17940000000.

The previous prime is 21112023001. The next prime is 21112023067. The reversal of 21112023031 is 13032021112.

It is a cyclic number.

It is not a de Polignac number, because 21112023031 - 2¹³ = 21112014839 is a prime.

It is a super-2 number, since 2×21112023031² (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 = 21112022996 and 21112023014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112023001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1404606 + ... + 1419556.

It is an arithmetic number, because the mean of its divisors is an integer number (768652416).

Almost surely, 2^21112023031 is an apocalyptic number.

21112023031 is a deficient number, since it is larger than the sum of its proper divisors (3484854281).

21112023031 is a wasteful number, since it uses less digits than its factorization.

21112023031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15135.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21112023031 its reverse (13032021112), we get a palindrome (34144044143).

The spelling of 21112023031 in words is "twenty-one billion, one hundred twelve million, twenty-three thousand, thirty-one".