21163933 has 24 divisors (see below), whose sum is σ = 26101440. Its totient is φ = 17075520.

The previous prime is 21163927. The next prime is 21163957. The reversal of 21163933 is 33936112.

It is a de Polignac number, because none of the positive numbers 2^k-21163933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100198 + ... + 100408.

It is an arithmetic number, because the mean of its divisors is an integer number (1087560).

Almost surely, 2^21163933 is an apocalyptic number.

21163933 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21163933 is a deficient number, since it is larger than the sum of its proper divisors (4937507).

21163933 is a wasteful number, since it uses less digits than its factorization.

21163933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 330 counting only the distinct ones).

The product of its digits is 2916, while the sum is 28.

The square root of 21163933 is about 4600.4274801370. The cubic root of 21163933 is about 276.6084603604.

The spelling of 21163933 in words is "twenty-one million, one hundred sixty-three thousand, nine hundred thirty-three".