21031095 has 16 divisors (see below), whose sum is σ = 33730560. Its totient is φ = 11189664.

The previous prime is 21031079. The next prime is 21031097. The reversal of 21031095 is 59013012.

It is not a de Polignac number, because 21031095 - 2⁴ = 21031079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031097) 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, 5866 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (2108160).

Almost surely, 2^21031095 is an apocalyptic number.

21031095 is a deficient number, since it is larger than the sum of its proper divisors (12699465).

21031095 is a wasteful number, since it uses less digits than its factorization.

21031095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 21031095 is about 4585.9671826126. The cubic root of 21031095 is about 276.0285230971.

The spelling of 21031095 in words is "twenty-one million, thirty-one thousand, ninety-five".