21610928407 has 2 divisors, whose sum is σ = 21610928408. Its totient is φ = 21610928406.

The previous prime is 21610928387. The next prime is 21610928431. The reversal of 21610928407 is 70482901612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21610928407 - 2²⁷ = 21476710679 is a prime.

It is a super-2 number, since 2×21610928407² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21610928407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21610928447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805464203 + 10805464204.

It is an arithmetic number, because the mean of its divisors is an integer number (10805464204).

Almost surely, 2^21610928407 is an apocalyptic number.

21610928407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610928407 is an equidigital number, since it uses as much as digits as its factorization.

21610928407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21610928407 in words is "twenty-one billion, six hundred ten million, nine hundred twenty-eight thousand, four hundred seven".