21113199 has 48 divisors (see below), whose sum is σ = 34145280. Its totient is φ = 12519360.

The previous prime is 21113173. The next prime is 21113221. The reversal of 21113199 is 99131112.

It is not a de Polignac number, because 21113199 - 2¹² = 21109103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 297334 + ... + 297404.

It is an arithmetic number, because the mean of its divisors is an integer number (711360).

Almost surely, 2^21113199 is an apocalyptic number.

21113199 is a deficient number, since it is larger than the sum of its proper divisors (13032081).

21113199 is a wasteful number, since it uses less digits than its factorization.

21113199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 177 counting only the distinct ones).

The product of its digits is 486, while the sum is 27.

The square root of 21113199 is about 4594.9101188163. The cubic root of 21113199 is about 276.3872556941.

It can be divided in two parts, 21113 and 199, that added together give a palindrome (21312).

The spelling of 21113199 in words is "twenty-one million, one hundred thirteen thousand, one hundred ninety-nine".