21195085 has 8 divisors (see below), whose sum is σ = 26311320. Its totient is φ = 16371264.

The previous prime is 21195077. The next prime is 21195091. The reversal of 21195085 is 58059112.

It can be written as a sum of positive squares in 4 ways, for example, as 3200521 + 17994564 = 1789^2 + 4242^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21195085 - 2³ = 21195077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72942 + ... + 73231.

It is an arithmetic number, because the mean of its divisors is an integer number (3288915).

Almost surely, 2^21195085 is an apocalyptic number.

It is an amenable number.

21195085 is a deficient number, since it is larger than the sum of its proper divisors (5116235).

21195085 is a wasteful number, since it uses less digits than its factorization.

21195085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146207.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 21195085 is about 4603.8120074564. The cubic root of 21195085 is about 276.7441106727.

The spelling of 21195085 in words is "twenty-one million, one hundred ninety-five thousand, eighty-five".