21795051 has 4 divisors (see below), whose sum is σ = 29060072. Its totient is φ = 14530032.

The previous prime is 21795043. The next prime is 21795079. The reversal of 21795051 is 15059712.

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

It is not a de Polignac number, because 21795051 - 2³ = 21795043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21795001) 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, 3632506 + ... + 3632511.

It is an arithmetic number, because the mean of its divisors is an integer number (7265018).

Almost surely, 2^21795051 is an apocalyptic number.

21795051 is a deficient number, since it is larger than the sum of its proper divisors (7265021).

21795051 is an equidigital number, since it uses as much as digits as its factorization.

21795051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7265020.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 21795051 is about 4668.5170022182. The cubic root of 21795051 is about 279.3311031632.

The spelling of 21795051 in words is "twenty-one million, seven hundred ninety-five thousand, fifty-one".