21838108 has 12 divisors (see below), whose sum is σ = 38646720. Its totient is φ = 10796192.

The previous prime is 21838099. The next prime is 21838121. The reversal of 21838108 is 80183812.

It is a super-2 number, since 2×21838108² = 953805922039328, 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 21838108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30316 + ... + 31027.

It is an arithmetic number, because the mean of its divisors is an integer number (3220560).

Almost surely, 2^21838108 is an apocalyptic number.

It is an amenable number.

21838108 is a deficient number, since it is larger than the sum of its proper divisors (16808612).

21838108 is a wasteful number, since it uses less digits than its factorization.

21838108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61436 (or 61434 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 21838108 is about 4673.1261485220. The cubic root of 21838108 is about 279.5149254438.

The spelling of 21838108 in words is "twenty-one million, eight hundred thirty-eight thousand, one hundred eight".