21065627 has 4 divisors (see below), whose sum is σ = 22980696. Its totient is φ = 19150560.

The previous prime is 21065621. The next prime is 21065641. The reversal of 21065627 is 72656012.

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

It is not a de Polignac number, because 21065627 - 2⁶ = 21065563 is a prime.

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 21065627.

It is not an unprimeable number, because it can be changed into a prime (21065621) 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, 957518 + ... + 957539.

It is an arithmetic number, because the mean of its divisors is an integer number (5745174).

Almost surely, 2^21065627 is an apocalyptic number.

21065627 is a deficient number, since it is larger than the sum of its proper divisors (1915069).

21065627 is a wasteful number, since it uses less digits than its factorization.

21065627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915068.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21065627 is about 4589.7306021160. The cubic root of 21065627 is about 276.1795154697.

The spelling of 21065627 in words is "twenty-one million, sixty-five thousand, six hundred twenty-seven".