21652024121 has 32 divisors (see below), whose sum is σ = 28027496448. Its totient is φ = 16265733120.

The previous prime is 21652024087. The next prime is 21652024127. The reversal of 21652024121 is 12142025612.

It is not a de Polignac number, because 21652024121 - 2⁶ = 21652024057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21652024127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77105 + ... + 221921.

It is an arithmetic number, because the mean of its divisors is an integer number (875859264).

Almost surely, 2^21652024121 is an apocalyptic number.

It is an amenable number.

21652024121 is a deficient number, since it is larger than the sum of its proper divisors (6375472327).

21652024121 is a wasteful number, since it uses less digits than its factorization.

21652024121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144921.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21652024121 its reverse (12142025612), we get a palindrome (33794049733).

The spelling of 21652024121 in words is "twenty-one billion, six hundred fifty-two million, twenty-four thousand, one hundred twenty-one".