21035918 has 8 divisors (see below), whose sum is σ = 32571840. Its totient is φ = 10178640.

The previous prime is 21035909. The next prime is 21035921. The reversal of 21035918 is 81953012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21035918² = 885019692205448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169583 + ... + 169706.

It is an arithmetic number, because the mean of its divisors is an integer number (4071480).

Almost surely, 2^21035918 is an apocalyptic number.

21035918 is a deficient number, since it is larger than the sum of its proper divisors (11535922).

21035918 is a wasteful number, since it uses less digits than its factorization.

21035918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339322.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 21035918 is about 4586.4929957430. The cubic root of 21035918 is about 276.0496217578.

The spelling of 21035918 in words is "twenty-one million, thirty-five thousand, nine hundred eighteen".