21163793 has 16 divisors (see below), whose sum is σ = 26440704. Its totient is φ = 16519680.

The previous prime is 21163781. The next prime is 21163817. The reversal of 21163793 is 39736112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21163793 - 2⁶ = 21163729 is a prime.

It is a super-2 number, since 2×21163793² = 895812268293698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 821 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1652544).

Almost surely, 2^21163793 is an apocalyptic number.

It is an amenable number.

21163793 is a deficient number, since it is larger than the sum of its proper divisors (5276911).

21163793 is a wasteful number, since it uses less digits than its factorization.

21163793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5792.

The product of its digits is 6804, while the sum is 32.

The square root of 21163793 is about 4600.4122641346. The cubic root of 21163793 is about 276.6078504349.

The spelling of 21163793 in words is "twenty-one million, one hundred sixty-three thousand, seven hundred ninety-three".