21222320031 has 40 divisors (see below), whose sum is σ = 35777134800. Its totient is φ = 12418479360.

The previous prime is 21222320023. The next prime is 21222320059. The reversal of 21222320031 is 13002322212.

21222320031 is a `hidden beast` number, since 212 + 223 + 200 + 31 = 666.

It is not a de Polignac number, because 21222320031 - 2³ = 21222320023 is a prime.

It is a super-2 number, since 2×21222320031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222319986 and 21222320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222320071) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 384826 + ... + 436503.

It is an arithmetic number, because the mean of its divisors is an integer number (894428370).

Almost surely, 2^21222320031 is an apocalyptic number.

21222320031 is a deficient number, since it is larger than the sum of its proper divisors (14554814769).

21222320031 is a wasteful number, since it uses less digits than its factorization.

21222320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821381 (or 821372 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21222320031 its reverse (13002322212), we get a palindrome (34224642243).

The spelling of 21222320031 in words is "twenty-one billion, two hundred twenty-two million, three hundred twenty thousand, thirty-one".