21323222310221 has 16 divisors (see below), whose sum is σ = 23143026570048. Its totient is φ = 19529124326400.

The previous prime is 21323222310167. The next prime is 21323222310239. The reversal of 21323222310221 is 12201322232312.

It is not a de Polignac number, because 21323222310221 - 2³⁴ = 21306042441037 is a prime.

It is a super-2 number, since 2×21323222310221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323222310421) 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, 8115410 + ... + 10416636.

It is an arithmetic number, because the mean of its divisors is an integer number (1446439160628).

Almost surely, 2^{21323222310221} is an apocalyptic number.

It is an amenable number.

21323222310221 is a deficient number, since it is larger than the sum of its proper divisors (1819804259827).

21323222310221 is a wasteful number, since it uses less digits than its factorization.

21323222310221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306812.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21323222310221 its reverse (12201322232312), we get a palindrome (33524544542533).

The spelling of 21323222310221 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty-two million, three hundred ten thousand, two hundred twenty-one".