21039627 has 16 divisors (see below), whose sum is σ = 32187392. Its totient is φ = 11975040.

The previous prime is 21039611. The next prime is 21039647. The reversal of 21039627 is 72693012.

It is not a de Polignac number, because 21039627 - 2⁴ = 21039611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21039594 and 21039603.

It is not an unprimeable number, because it can be changed into a prime (21039647) 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, 3843 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (2011712).

Almost surely, 2^21039627 is an apocalyptic number.

21039627 is a deficient number, since it is larger than the sum of its proper divisors (11147765).

21039627 is a wasteful number, since it uses less digits than its factorization.

21039627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 21039627 is about 4586.8973173595. The cubic root of 21039627 is about 276.0658449287.

The spelling of 21039627 in words is "twenty-one million, thirty-nine thousand, six hundred twenty-seven".