21623185331 has 12 divisors (see below), whose sum is σ = 24273334176. Its totient is φ = 19239192720.

The previous prime is 21623185319. The next prime is 21623185333. The reversal of 21623185331 is 13358132612.

It is not a de Polignac number, because 21623185331 - 2¹⁴ = 21623168947 is a prime.

It is a super-2 number, since 2×21623185331² (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 = 21623185291 and 21623185300.

It is not an unprimeable number, because it can be changed into a prime (21623185333) 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, 1895420 + ... + 1906793.

It is an arithmetic number, because the mean of its divisors is an integer number (2022777848).

Almost surely, 2^21623185331 is an apocalyptic number.

21623185331 is a deficient number, since it is larger than the sum of its proper divisors (2650148845).

21623185331 is a wasteful number, since it uses less digits than its factorization.

21623185331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802282 (or 3802271 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The spelling of 21623185331 in words is "twenty-one billion, six hundred twenty-three million, one hundred eighty-five thousand, three hundred thirty-one".