21433393 has 8 divisors (see below), whose sum is σ = 22083776. Its totient is φ = 20790000.

The previous prime is 21433361. The next prime is 21433417. The reversal of 21433393 is 39333412.

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 21433393 - 2⁵ = 21433361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21439393) 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, 4843 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (2760472).

Almost surely, 2^21433393 is an apocalyptic number.

It is an amenable number.

21433393 is a deficient number, since it is larger than the sum of its proper divisors (650383).

21433393 is a wasteful number, since it uses less digits than its factorization.

21433393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495.

The product of its digits is 5832, while the sum is 28.

The square root of 21433393 is about 4629.6212588072. The cubic root of 21433393 is about 277.7774429448. Note that the first 3 decimals are identical.

The spelling of 21433393 in words is "twenty-one million, four hundred thirty-three thousand, three hundred ninety-three".