21332605 has 8 divisors (see below), whose sum is σ = 29256192. Its totient is φ = 14628048.

The previous prime is 21332579. The next prime is 21332621. The reversal of 21332605 is 50623312.

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 21332605 - 2¹⁹ = 20808317 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, 304717 + ... + 304786.

It is an arithmetic number, because the mean of its divisors is an integer number (3657024).

Almost surely, 2^21332605 is an apocalyptic number.

It is an amenable number.

21332605 is a deficient number, since it is larger than the sum of its proper divisors (7923587).

21332605 is an equidigital number, since it uses as much as digits as its factorization.

21332605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609515.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 21332605 is about 4618.7233084479. The cubic root of 21332605 is about 277.3413534660.

Adding to 21332605 its reverse (50623312), we get a palindrome (71955917).

The spelling of 21332605 in words is "twenty-one million, three hundred thirty-two thousand, six hundred five".