21121001203023 has 24 divisors (see below), whose sum is σ = 30783758836272. Its totient is φ = 13953492096768.

The previous prime is 21121001202989. The next prime is 21121001203037. The reversal of 21121001203023 is 32030210012112.

It is not a de Polignac number, because 21121001203023 - 2²⁵ = 21120967648591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121001202987 and 21121001203005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121001203723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3627765 + ... + 7443297.

It is an arithmetic number, because the mean of its divisors is an integer number (1282656618178).

Almost surely, 2^{21121001203023} is an apocalyptic number.

21121001203023 is a deficient number, since it is larger than the sum of its proper divisors (9662757633249).

21121001203023 is a wasteful number, since it uses less digits than its factorization.

21121001203023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821095 (or 3821092 counting only the distinct ones).

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

Adding to 21121001203023 its reverse (32030210012112), we get a palindrome (53151211215135).

The spelling of 21121001203023 in words is "twenty-one trillion, one hundred twenty-one billion, one million, two hundred three thousand, twenty-three".