21995495 has 8 divisors (see below), whose sum is σ = 26842320. Its totient is φ = 17297920.

The previous prime is 21995473. The next prime is 21995507. The reversal of 21995495 is 59459912.

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

It is not a de Polignac number, because 21995495 - 2⁶ = 21995431 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, 36986 + ... + 37575.

It is an arithmetic number, because the mean of its divisors is an integer number (3355290).

Almost surely, 2^21995495 is an apocalyptic number.

21995495 is a deficient number, since it is larger than the sum of its proper divisors (4846825).

21995495 is an equidigital number, since it uses as much as digits as its factorization.

21995495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74625.

The product of its digits is 145800, while the sum is 44.

The square root of 21995495 is about 4689.9355006226. The cubic root of 21995495 is about 280.1848057187.

The spelling of 21995495 in words is "twenty-one million, nine hundred ninety-five thousand, four hundred ninety-five".