21795937 has 4 divisors (see below), whose sum is σ = 21841920. Its totient is φ = 21749956.

The previous prime is 21795931. The next prime is 21795947. The reversal of 21795937 is 73959712.

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 a de Polignac number, because none of the positive numbers 2^k-21795937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21795893 and 21795902.

It is not an unprimeable number, because it can be changed into a prime (21795931) 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, 22273 + ... + 23230.

It is an arithmetic number, because the mean of its divisors is an integer number (5460480).

Almost surely, 2^21795937 is an apocalyptic number.

It is an amenable number.

21795937 is a deficient number, since it is larger than the sum of its proper divisors (45983).

21795937 is an equidigital number, since it uses as much as digits as its factorization.

21795937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45982.

The product of its digits is 119070, while the sum is 43.

The square root of 21795937 is about 4668.6118922009. The cubic root of 21795937 is about 279.3348881815.

The spelling of 21795937 in words is "twenty-one million, seven hundred ninety-five thousand, nine hundred thirty-seven".