21433605 has 16 divisors (see below), whose sum is σ = 34649664. Its totient is φ = 11312640.

The previous prime is 21433597. The next prime is 21433609. The reversal of 21433605 is 50633412.

It is a happy number.

It is not a de Polignac number, because 21433605 - 2³ = 21433597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5911 + ... + 8820.

It is an arithmetic number, because the mean of its divisors is an integer number (2165604).

Almost surely, 2^21433605 is an apocalyptic number.

It is an amenable number.

21433605 is a deficient number, since it is larger than the sum of its proper divisors (13216059).

21433605 is a wasteful number, since it uses less digits than its factorization.

21433605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14836.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21433605 is about 4629.6441547920. The cubic root of 21433605 is about 277.7783587840.

The spelling of 21433605 in words is "twenty-one million, four hundred thirty-three thousand, six hundred five".