21326937 has 4 divisors (see below), whose sum is σ = 28435920. Its totient is φ = 14217956.

The previous prime is 21326917. The next prime is 21326939. The reversal of 21326937 is 73962312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21326937 - 2²⁰ = 20278361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21326898 and 21326907.

It is not an unprimeable number, because it can be changed into a prime (21326939) 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, 3554487 + ... + 3554492.

It is an arithmetic number, because the mean of its divisors is an integer number (7108980).

Almost surely, 2^21326937 is an apocalyptic number.

It is an amenable number.

21326937 is a deficient number, since it is larger than the sum of its proper divisors (7108983).

21326937 is an equidigital number, since it uses as much as digits as its factorization.

21326937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108982.

The product of its digits is 13608, while the sum is 33.

The square root of 21326937 is about 4618.1096782125. The cubic root of 21326937 is about 277.3167884081.

The spelling of 21326937 in words is "twenty-one million, three hundred twenty-six thousand, nine hundred thirty-seven".