21723755614121 has 32 divisors (see below), whose sum is σ = 23972105364480. Its totient is φ = 19521832507200.

The previous prime is 21723755614063. The next prime is 21723755614129. The reversal of 21723755614121 is 12141655732712.

It is a cyclic number.

It is not a de Polignac number, because 21723755614121 - 2²² = 21723751419817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21723755614129) 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, 1064514500 + ... + 1064534906.

It is an arithmetic number, because the mean of its divisors is an integer number (749128292640).

Almost surely, 2^{21723755614121} is an apocalyptic number.

It is an amenable number.

21723755614121 is a deficient number, since it is larger than the sum of its proper divisors (2248349750359).

21723755614121 is a wasteful number, since it uses less digits than its factorization.

21723755614121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22445.

The product of its digits is 705600, while the sum is 47.

The spelling of 21723755614121 in words is "twenty-one trillion, seven hundred twenty-three billion, seven hundred fifty-five million, six hundred fourteen thousand, one hundred twenty-one".