21090295 has 8 divisors (see below), whose sum is σ = 25334496. Its totient is φ = 16854816.

The previous prime is 21090271. The next prime is 21090299. The reversal of 21090295 is 59209012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21090295 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5814 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (3166812).

Almost surely, 2^21090295 is an apocalyptic number.

21090295 is a deficient number, since it is larger than the sum of its proper divisors (4244201).

21090295 is a wasteful number, since it uses less digits than its factorization.

21090295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 21090295 is about 4592.4171195570. The cubic root of 21090295 is about 276.2872761476.

The spelling of 21090295 in words is "twenty-one million, ninety thousand, two hundred ninety-five".