10021123231 has 6 divisors (see below), whose sum is σ = 11657225040. Its totient is φ = 8589534156.

The previous prime is 10021123213. The next prime is 10021123237. The reversal of 10021123231 is 13232112001.

It is not a de Polignac number, because 10021123231 - 2⁷ = 10021123103 is a prime.

It is a super-2 number, since 2×10021123231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10021123237) 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, 102256311 + ... + 102256408.

It is an arithmetic number, because the mean of its divisors is an integer number (1942870840).

Almost surely, 2^10021123231 is an apocalyptic number.

10021123231 is a deficient number, since it is larger than the sum of its proper divisors (1636101809).

10021123231 is an equidigital number, since it uses as much as digits as its factorization.

10021123231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204512733 (or 204512726 counting only the distinct ones).

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

Adding to 10021123231 its reverse (13232112001), we get a palindrome (23253235232).

The spelling of 10021123231 in words is "ten billion, twenty-one million, one hundred twenty-three thousand, two hundred thirty-one".