21123302331121 has 16 divisors (see below), whose sum is σ = 22342415090688. Its totient is φ = 19938059942400.

The previous prime is 21123302331049. The next prime is 21123302331137. The reversal of 21123302331121 is 12113320332112.

It is a cyclic number.

It is not a de Polignac number, because 21123302331121 - 2²⁵ = 21123268776689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123302331821) 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, 2630100 + ... + 7011706.

It is an arithmetic number, because the mean of its divisors is an integer number (1396400943168).

Almost surely, 2^{21123302331121} is an apocalyptic number.

It is an amenable number.

21123302331121 is a deficient number, since it is larger than the sum of its proper divisors (1219112759567).

21123302331121 is a wasteful number, since it uses less digits than its factorization.

21123302331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385472.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21123302331121 its reverse (12113320332112), we get a palindrome (33236622663233).

The spelling of 21123302331121 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred two million, three hundred thirty-one thousand, one hundred twenty-one".