21223233031 has 32 divisors (see below), whose sum is σ = 28519561728. Its totient is φ = 15252589440.

The previous prime is 21223232999. The next prime is 21223233043. The reversal of 21223233031 is 13033232212.

It is not a de Polignac number, because 21223233031 - 2⁵ = 21223232999 is a prime.

It is a super-2 number, since 2×21223233031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223232993 and 21223233011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223233061) 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, 1269976 + ... + 1286578.

It is an arithmetic number, because the mean of its divisors is an integer number (891236304).

Almost surely, 2^21223233031 is an apocalyptic number.

21223233031 is a deficient number, since it is larger than the sum of its proper divisors (7296328697).

21223233031 is a wasteful number, since it uses less digits than its factorization.

21223233031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17911.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21223233031 its reverse (13033232212), we get a palindrome (34256465243).

The spelling of 21223233031 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-three thousand, thirty-one".