21652931 has 2 divisors, whose sum is σ = 21652932. Its totient is φ = 21652930.

The previous prime is 21652927. The next prime is 21652949. The reversal of 21652931 is 13925612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21652931 - 2² = 21652927 is a prime.

It is a super-2 number, since 2×21652931² = 937698841781522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21652894 and 21652903.

It is not a weakly prime, because it can be changed into another prime (21652901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826465 + 10826466.

It is an arithmetic number, because the mean of its divisors is an integer number (10826466).

Almost surely, 2^21652931 is an apocalyptic number.

21652931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652931 is an equidigital number, since it uses as much as digits as its factorization.

21652931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 21652931 is about 4653.2710000601. The cubic root of 21652931 is about 278.7226295795.

The spelling of 21652931 in words is "twenty-one million, six hundred fifty-two thousand, nine hundred thirty-one".