21195995 has 16 divisors (see below), whose sum is σ = 26740800. Its totient is φ = 16097664.

The previous prime is 21195989. The next prime is 21195997. The reversal of 21195995 is 59959112.

It is a cyclic number.

It is not a de Polignac number, because 21195995 - 2⁸ = 21195739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21195997) 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, 16517 + ... + 17753.

It is an arithmetic number, because the mean of its divisors is an integer number (1671300).

Almost surely, 2^21195995 is an apocalyptic number.

21195995 is a deficient number, since it is larger than the sum of its proper divisors (5544805).

21195995 is a wasteful number, since it uses less digits than its factorization.

21195995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414.

The product of its digits is 36450, while the sum is 41.

The square root of 21195995 is about 4603.9108375380. The cubic root of 21195995 is about 276.7480712377.

The spelling of 21195995 in words is "twenty-one million, one hundred ninety-five thousand, nine hundred ninety-five".