21838616 has 8 divisors (see below), whose sum is σ = 40947420. Its totient is φ = 10919304.

The previous prime is 21838603. The next prime is 21838627. The reversal of 21838616 is 61683812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364906 + ... + 1364921.

Almost surely, 2^21838616 is an apocalyptic number.

It is an amenable number.

21838616 is a deficient number, since it is larger than the sum of its proper divisors (19108804).

21838616 is a wasteful number, since it uses less digits than its factorization.

21838616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729833 (or 2729829 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 21838616 is about 4673.1805015428. The cubic root of 21838616 is about 279.5170927940.

The spelling of 21838616 in words is "twenty-one million, eight hundred thirty-eight thousand, six hundred sixteen".