21693005 has 8 divisors (see below), whose sum is σ = 26361600. Its totient is φ = 17134416.

The previous prime is 21692987. The next prime is 21693011. The reversal of 21693005 is 50039612.

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 21693005 - 2¹⁸ = 21430861 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, 27065 + ... + 27854.

It is an arithmetic number, because the mean of its divisors is an integer number (3295200).

Almost surely, 2^21693005 is an apocalyptic number.

It is an amenable number.

21693005 is a deficient number, since it is larger than the sum of its proper divisors (4668595).

21693005 is an equidigital number, since it uses as much as digits as its factorization.

21693005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55003.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 21693005 is about 4657.5750128151. The cubic root of 21693005 is about 278.8944715515.

The spelling of 21693005 in words is "twenty-one million, six hundred ninety-three thousand, five".