21627697 has 16 divisors (see below), whose sum is σ = 26747392. Its totient is φ = 17029440.

The previous prime is 21627679. The next prime is 21627713. The reversal of 21627697 is 79672612.

It is a cyclic number.

It is not a de Polignac number, because 21627697 - 2⁷ = 21627569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21627607) 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, 24223 + ... + 25099.

It is an arithmetic number, because the mean of its divisors is an integer number (1671712).

Almost surely, 2^21627697 is an apocalyptic number.

It is an amenable number.

21627697 is a deficient number, since it is larger than the sum of its proper divisors (5119695).

21627697 is a wasteful number, since it uses less digits than its factorization.

21627697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its digits is 63504, while the sum is 40.

The square root of 21627697 is about 4650.5587836302. The cubic root of 21627697 is about 278.6143144393.

The spelling of 21627697 in words is "twenty-one million, six hundred twenty-seven thousand, six hundred ninety-seven".