21223176220051 has 12 divisors (see below), whose sum is σ = 22983468777480. Its totient is φ = 19588783219200.

The previous prime is 21223176220039. The next prime is 21223176220061. The reversal of 21223176220051 is 15002267132212.

It is not a de Polignac number, because 21223176220051 - 2²³ = 21223167831443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223176219989 and 21223176220016.

It is not an unprimeable number, because it can be changed into a prime (21223176220061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4095246 + ... + 7695283.

It is an arithmetic number, because the mean of its divisors is an integer number (1915289064790).

Almost surely, 2^{21223176220051} is an apocalyptic number.

21223176220051 is a deficient number, since it is larger than the sum of its proper divisors (1760292557429).

21223176220051 is a wasteful number, since it uses less digits than its factorization.

21223176220051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801206 (or 11801193 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21223176220051 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred seventy-six million, two hundred twenty thousand, fifty-one".