21379627 has 4 divisors (see below), whose sum is σ = 22309200. Its totient is φ = 20450056.

The previous prime is 21379619. The next prime is 21379663. The reversal of 21379627 is 72697312.

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 21379627 - 2³ = 21379619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21379697) 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, 464752 + ... + 464797.

It is an arithmetic number, because the mean of its divisors is an integer number (5577300).

Almost surely, 2^21379627 is an apocalyptic number.

21379627 is a deficient number, since it is larger than the sum of its proper divisors (929573).

21379627 is an equidigital number, since it uses as much as digits as its factorization.

21379627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929572.

The product of its digits is 31752, while the sum is 37.

The square root of 21379627 is about 4623.8108741600. The cubic root of 21379627 is about 277.5449787763.

The spelling of 21379627 in words is "twenty-one million, three hundred seventy-nine thousand, six hundred twenty-seven".