21620627 has 16 divisors (see below), whose sum is σ = 25239552. Its totient is φ = 18139680.

The previous prime is 21620603. The next prime is 21620659. The reversal of 21620627 is 72602612.

It is a cyclic number.

It is not a de Polignac number, because 21620627 - 2⁶ = 21620563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21620596 and 21620605.

It is not an unprimeable number, because it can be changed into a prime (21620227) 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, 113102 + ... + 113292.

It is an arithmetic number, because the mean of its divisors is an integer number (1577472).

Almost surely, 2^21620627 is an apocalyptic number.

21620627 is a deficient number, since it is larger than the sum of its proper divisors (3618925).

21620627 is a wasteful number, since it uses less digits than its factorization.

21620627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21620627 is about 4649.7985977889. The cubic root of 21620627 is about 278.5839518618.

The spelling of 21620627 in words is "twenty-one million, six hundred twenty thousand, six hundred twenty-seven".