21010995 has 24 divisors (see below), whose sum is σ = 37770096. Its totient is φ = 11205216.

The previous prime is 21010987. The next prime is 21011009. The reversal of 21010995 is 59901012.

It is a happy number.

It is not a de Polignac number, because 21010995 - 2³ = 21010987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7432 + ... + 9861.

It is an arithmetic number, because the mean of its divisors is an integer number (1573754).

Almost surely, 2^21010995 is an apocalyptic number.

21010995 is a deficient number, since it is larger than the sum of its proper divisors (16759101).

21010995 is an equidigital number, since it uses as much as digits as its factorization.

21010995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17313 (or 17301 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 21010995 is about 4583.7751908225. The cubic root of 21010995 is about 275.9405590330.

The spelling of 21010995 in words is "twenty-one million, ten thousand, nine hundred ninety-five".