21790006627 has 4 divisors (see below), whose sum is σ = 21793333320. Its totient is φ = 21786679936.

The previous prime is 21790006597. The next prime is 21790006633. The reversal of 21790006627 is 72660009712.

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

It is a cyclic number.

It is not a de Polignac number, because 21790006627 - 2⁷ = 21790006499 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21790006627.

It is not an unprimeable number, because it can be changed into a prime (21790000627) 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, 1653502 + ... + 1666627.

It is an arithmetic number, because the mean of its divisors is an integer number (5448333330).

Almost surely, 2^21790006627 is an apocalyptic number.

21790006627 is a deficient number, since it is larger than the sum of its proper divisors (3326693).

21790006627 is an equidigital number, since it uses as much as digits as its factorization.

21790006627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326692.

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

The spelling of 21790006627 in words is "twenty-one billion, seven hundred ninety million, six thousand, six hundred twenty-seven".