21790627 has 4 divisors (see below), whose sum is σ = 21825160. Its totient is φ = 21756096.

The previous prime is 21790621. The next prime is 21790633. The reversal of 21790627 is 72609712.

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

It is an interprime number because it is at equal distance from previous prime (21790621) and next prime (21790633).

It is a cyclic number.

It is not a de Polignac number, because 21790627 - 2³ = 21790619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21790592 and 21790601.

It is not an unprimeable number, because it can be changed into a prime (21790621) 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, 16302 + ... + 17587.

It is an arithmetic number, because the mean of its divisors is an integer number (5456290).

Almost surely, 2^21790627 is an apocalyptic number.

21790627 is a deficient number, since it is larger than the sum of its proper divisors (34533).

21790627 is an equidigital number, since it uses as much as digits as its factorization.

21790627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34532.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21790627 is about 4668.0431660386. The cubic root of 21790627 is about 279.3122021686.

The spelling of 21790627 in words is "twenty-one million, seven hundred ninety thousand, six hundred twenty-seven".