21011230023 has 16 divisors (see below), whose sum is σ = 32422394880. Its totient is φ = 11854436256.

The previous prime is 21011229991. The next prime is 21011230067. The reversal of 21011230023 is 32003211012.

It is not a de Polignac number, because 21011230023 - 2⁵ = 21011229991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011229984 and 21011230011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011210023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6330840 + ... + 6334157.

It is an arithmetic number, because the mean of its divisors is an integer number (2026399680).

Almost surely, 2^21011230023 is an apocalyptic number.

21011230023 is a deficient number, since it is larger than the sum of its proper divisors (11411164857).

21011230023 is a wasteful number, since it uses less digits than its factorization.

21011230023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12665086.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21011230023 its reverse (32003211012), we get a palindrome (53014441035).

The spelling of 21011230023 in words is "twenty-one billion, eleven million, two hundred thirty thousand, twenty-three".