21365495 has 8 divisors (see below), whose sum is σ = 26184384. Its totient is φ = 16728544.

The previous prime is 21365441. The next prime is 21365497. The reversal of 21365495 is 59456312.

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 21365495 - 2¹⁰ = 21364471 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 (21365497) 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, 45224 + ... + 45693.

It is an arithmetic number, because the mean of its divisors is an integer number (3273048).

Almost surely, 2^21365495 is an apocalyptic number.

21365495 is a deficient number, since it is larger than the sum of its proper divisors (4818889).

21365495 is an equidigital number, since it uses as much as digits as its factorization.

21365495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90969.

The product of its digits is 32400, while the sum is 35.

The square root of 21365495 is about 4622.2824448534. The cubic root of 21365495 is about 277.4838125990.

The spelling of 21365495 in words is "twenty-one million, three hundred sixty-five thousand, four hundred ninety-five".