21132023121 has 16 divisors (see below), whose sum is σ = 34152765120. Its totient is φ = 12807286560.

The previous prime is 21132023093. The next prime is 21132023161. The reversal of 21132023121 is 12132023112.

It is not a de Polignac number, because 21132023121 - 2⁶ = 21132023057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21132023094 and 21132023103.

It is not an unprimeable number, because it can be changed into a prime (21132023161) 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, 35575500 + ... + 35576093.

It is an arithmetic number, because the mean of its divisors is an integer number (2134547820).

Almost surely, 2^21132023121 is an apocalyptic number.

It is an amenable number.

21132023121 is a deficient number, since it is larger than the sum of its proper divisors (13020741999).

21132023121 is a wasteful number, since it uses less digits than its factorization.

21132023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71151613 (or 71151607 counting only the distinct ones).

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

Adding to 21132023121 its reverse (12132023112), we get a palindrome (33264046233).

Subtracting from 21132023121 its reverse (12132023112), we obtain a palindrome (9000000009).

The spelling of 21132023121 in words is "twenty-one billion, one hundred thirty-two million, twenty-three thousand, one hundred twenty-one".