21700627 has 4 divisors (see below), whose sum is σ = 23369920. Its totient is φ = 20031336.

The previous prime is 21700621. The next prime is 21700631. The reversal of 21700627 is 72600712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21700627 - 2¹⁵ = 21667859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21700621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834627 + ... + 834652.

It is an arithmetic number, because the mean of its divisors is an integer number (5842480).

Almost surely, 2^21700627 is an apocalyptic number.

21700627 is a deficient number, since it is larger than the sum of its proper divisors (1669293).

21700627 is a wasteful number, since it uses less digits than its factorization.

21700627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669292.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21700627 is about 4658.3931779102. The cubic root of 21700627 is about 278.9271316148.

The spelling of 21700627 in words is "twenty-one million, seven hundred thousand, six hundred twenty-seven".