21112321023 has 48 divisors (see below), whose sum is σ = 32376804096. Its totient is φ = 13228997760.

The previous prime is 21112321007. The next prime is 21112321037. The reversal of 21112321023 is 32012321112.

It is not a de Polignac number, because 21112321023 - 2⁴ = 21112321007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112320987 and 21112321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112321423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6336468 + ... + 6339798.

It is an arithmetic number, because the mean of its divisors is an integer number (674516752).

Almost surely, 2^21112321023 is an apocalyptic number.

21112321023 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21112321023 is a deficient number, since it is larger than the sum of its proper divisors (11264483073).

21112321023 is a wasteful number, since it uses less digits than its factorization.

21112321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884 (or 3881 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112321023 its reverse (32012321112), we get a palindrome (53124642135).

The spelling of 21112321023 in words is "twenty-one billion, one hundred twelve million, three hundred twenty-one thousand, twenty-three".