21895005 has 16 divisors (see below), whose sum is σ = 38217024. Its totient is φ = 10615680.

The previous prime is 21894991. The next prime is 21895037. The reversal of 21895005 is 50059812.

It is not a de Polignac number, because 21895005 - 2⁶ = 21894941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66184 + ... + 66513.

It is an arithmetic number, because the mean of its divisors is an integer number (2388564).

Almost surely, 2^21895005 is an apocalyptic number.

It is an amenable number.

21895005 is a deficient number, since it is larger than the sum of its proper divisors (16322019).

21895005 is a wasteful number, since it uses less digits than its factorization.

21895005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132716.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 21895005 is about 4679.2098691980. The cubic root of 21895005 is about 279.7574642962.

The spelling of 21895005 in words is "twenty-one million, eight hundred ninety-five thousand, five".