21072995 has 16 divisors (see below), whose sum is σ = 27540000. Its totient is φ = 15418368.

The previous prime is 21072973. The next prime is 21073001. The reversal of 21072995 is 59927012.

It is a cyclic number.

It is not a de Polignac number, because 21072995 - 2²² = 16878691 is a prime.

It is a super-2 number, since 2×21072995² = 888142236540050, which contains 22 as substring.

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, 1070 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (1721250).

Almost surely, 2^21072995 is an apocalyptic number.

21072995 is a deficient number, since it is larger than the sum of its proper divisors (6467005).

21072995 is a wasteful number, since it uses less digits than its factorization.

21072995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 21072995 is about 4590.5331934319. The cubic root of 21072995 is about 276.2117109426.

The spelling of 21072995 in words is "twenty-one million, seventy-two thousand, nine hundred ninety-five".