21220302931 has 16 divisors (see below), whose sum is σ = 23593968640. Its totient is φ = 19002483360.

The previous prime is 21220302889. The next prime is 21220302973. The reversal of 21220302931 is 13920302212.

It is an interprime number because it is at equal distance from previous prime (21220302889) and next prime (21220302973).

It is a cyclic number.

It is not a de Polignac number, because 21220302931 - 2¹⁵ = 21220270163 is a prime.

It is a super-2 number, since 2×21220302931² (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 = 21220302896 and 21220302905.

It is not an unprimeable number, because it can be changed into a prime (21220302031) 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, 393600 + ... + 444253.

It is an arithmetic number, because the mean of its divisors is an integer number (1474623040).

Almost surely, 2^21220302931 is an apocalyptic number.

21220302931 is a deficient number, since it is larger than the sum of its proper divisors (2373665709).

21220302931 is a wasteful number, since it uses less digits than its factorization.

21220302931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837946.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21220302931 in words is "twenty-one billion, two hundred twenty million, three hundred two thousand, nine hundred thirty-one".