21723755614151 has 4 divisors (see below), whose sum is σ = 23001623591472. Its totient is φ = 20445887636832.

The previous prime is 21723755614129. The next prime is 21723755614159. The reversal of 21723755614151 is 15141655732712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21723755614151 - 2²⁶ = 21723688505287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21723755614151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21723755614159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638933988635 + ... + 638933988668.

It is an arithmetic number, because the mean of its divisors is an integer number (5750405897868).

Almost surely, 2^{21723755614151} is an apocalyptic number.

21723755614151 is a deficient number, since it is larger than the sum of its proper divisors (1277867977321).

21723755614151 is a wasteful number, since it uses less digits than its factorization.

21723755614151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277867977320.

The product of its digits is 1764000, while the sum is 50.

The spelling of 21723755614151 in words is "twenty-one trillion, seven hundred twenty-three billion, seven hundred fifty-five million, six hundred fourteen thousand, one hundred fifty-one".