21627713 has 2 divisors, whose sum is σ = 21627714. Its totient is φ = 21627712.

The previous prime is 21627679. The next prime is 21627731. The reversal of 21627713 is 31772612.

Together with next prime (21627731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 8832784 = 3577^2 + 2972^2 .

It is a cyclic number.

It is not a de Polignac number, because 21627713 - 2⁸ = 21627457 is a prime.

It is a super-2 number, since 2×21627713² = 935515939220738, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21627743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10813856 + 10813857.

It is an arithmetic number, because the mean of its divisors is an integer number (10813857).

Almost surely, 2^21627713 is an apocalyptic number.

It is an amenable number.

21627713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21627713 is an equidigital number, since it uses as much as digits as its factorization.

21627713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 29.

The square root of 21627713 is about 4650.5605038533. The cubic root of 21627713 is about 278.6143831449.

The spelling of 21627713 in words is "twenty-one million, six hundred twenty-seven thousand, seven hundred thirteen".