21113699 has 4 divisors (see below), whose sum is σ = 21331464. Its totient is φ = 20895936.

The previous prime is 21113689. The next prime is 21113707. The reversal of 21113699 is 99631112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21113699 - 2²⁴ = 4336483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108737 + ... + 108930.

It is an arithmetic number, because the mean of its divisors is an integer number (5332866).

Almost surely, 2^21113699 is an apocalyptic number.

21113699 is a deficient number, since it is larger than the sum of its proper divisors (217765).

21113699 is an equidigital number, since it uses as much as digits as its factorization.

21113699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217764.

The product of its digits is 2916, while the sum is 32.

The square root of 21113699 is about 4594.9645265225. The cubic root of 21113699 is about 276.3894374658.

It can be divided in two parts, 21113 and 699, that added together give a palindrome (21812).

The spelling of 21113699 in words is "twenty-one million, one hundred thirteen thousand, six hundred ninety-nine".