21103868 has 24 divisors (see below), whose sum is σ = 39245472. Its totient is φ = 9895424.

The previous prime is 21103847. The next prime is 21103879. The reversal of 21103868 is 86830112.

It is a super-2 number, since 2×21103868² = 890746489122848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21103868.

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, 33896 + ... + 34512.

It is an arithmetic number, because the mean of its divisors is an integer number (1635228).

Almost surely, 2^21103868 is an apocalyptic number.

It is an amenable number.

21103868 is a deficient number, since it is larger than the sum of its proper divisors (18141604).

21103868 is a wasteful number, since it uses less digits than its factorization.

21103868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 21103868 is about 4593.8946439813. The cubic root of 21103868 is about 276.3465331505.

The spelling of 21103868 in words is "twenty-one million, one hundred three thousand, eight hundred sixty-eight".