21323113331 has 16 divisors (see below), whose sum is σ = 23347354464. Its totient is φ = 19356420864.

The previous prime is 21323113319. The next prime is 21323113363. The reversal of 21323113331 is 13331132312.

It is a cyclic number.

It is not a de Polignac number, because 21323113331 - 2²⁶ = 21256004467 is a prime.

It is a super-2 number, since 2×21323113331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323113297 and 21323113306.

It is not an unprimeable number, because it can be changed into a prime (21323113531) 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, 134621 + ... + 246513.

It is an arithmetic number, because the mean of its divisors is an integer number (1459209654).

Almost surely, 2^21323113331 is an apocalyptic number.

21323113331 is a deficient number, since it is larger than the sum of its proper divisors (2024241133).

21323113331 is a wasteful number, since it uses less digits than its factorization.

21323113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112150.

The product of its digits is 972, while the sum is 23.

Adding to 21323113331 its reverse (13331132312), we get a palindrome (34654245643).

The spelling of 21323113331 in words is "twenty-one billion, three hundred twenty-three million, one hundred thirteen thousand, three hundred thirty-one".