21113902 has 16 divisors (see below), whose sum is σ = 34241040. Its totient is φ = 9730368.

The previous prime is 21113887. The next prime is 21113927. The reversal of 21113902 is 20931112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21113902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6103 + ... + 8914.

It is an arithmetic number, because the mean of its divisors is an integer number (2140065).

Almost surely, 2^21113902 is an apocalyptic number.

21113902 is a deficient number, since it is larger than the sum of its proper divisors (13127138).

21113902 is a wasteful number, since it uses less digits than its factorization.

21113902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21113902 is about 4594.9866158673. The cubic root of 21113902 is about 276.3903232552.

The spelling of 21113902 in words is "twenty-one million, one hundred thirteen thousand, nine hundred two".