21012095 has 32 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 14676480.

The previous prime is 21012091. The next prime is 21012127. The reversal of 21012095 is 59021012.

It is not a de Polignac number, because 21012095 - 2² = 21012091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133757 + ... + 133913.

It is an arithmetic number, because the mean of its divisors is an integer number (895860).

Almost surely, 2^21012095 is an apocalyptic number.

21012095 is a deficient number, since it is larger than the sum of its proper divisors (7655425).

21012095 is a wasteful number, since it uses less digits than its factorization.

21012095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21012095 is about 4583.8951776846. The cubic root of 21012095 is about 275.9453744375.

The spelling of 21012095 in words is "twenty-one million, twelve thousand, ninety-five".