21610607 has 2 divisors, whose sum is σ = 21610608. Its totient is φ = 21610606.

The previous prime is 21610583. The next prime is 21610609. The reversal of 21610607 is 70601612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21610607 - 2²² = 17416303 is a prime.

Together with 21610609, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21610609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805303 + 10805304.

It is an arithmetic number, because the mean of its divisors is an integer number (10805304).

Almost surely, 2^21610607 is an apocalyptic number.

21610607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610607 is an equidigital number, since it uses as much as digits as its factorization.

21610607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21610607 is about 4648.7210069007. The cubic root of 21610607 is about 278.5409089761.

The spelling of 21610607 in words is "twenty-one million, six hundred ten thousand, six hundred seven".