21945795 has 16 divisors (see below), whose sum is σ = 36640512. Its totient is φ = 11195360.

The previous prime is 21945769. The next prime is 21945797. The reversal of 21945795 is 59754912.

It is not a de Polignac number, because 21945795 - 2⁷ = 21945667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21945797) 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, 31461 + ... + 32150.

It is an arithmetic number, because the mean of its divisors is an integer number (2290032).

Almost surely, 2^21945795 is an apocalyptic number.

21945795 is a deficient number, since it is larger than the sum of its proper divisors (14694717).

21945795 is a wasteful number, since it uses less digits than its factorization.

21945795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63642.

The product of its digits is 113400, while the sum is 42.

The square root of 21945795 is about 4684.6339237981. The cubic root of 21945795 is about 279.9736157112.

The spelling of 21945795 in words is "twenty-one million, nine hundred forty-five thousand, seven hundred ninety-five".