21416238 has 20 divisors (see below), whose sum is σ = 47988600. Its totient is φ = 7138692.

The previous prime is 21416183. The next prime is 21416281. The reversal of 21416238 is 83261412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65938 + ... + 66261.

It is an arithmetic number, because the mean of its divisors is an integer number (2399430).

Almost surely, 2^21416238 is an apocalyptic number.

21416238 is an abundant number, since it is smaller than the sum of its proper divisors (26572362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21416238 is a wasteful number, since it uses less digits than its factorization.

21416238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132213 (or 132204 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 21416238 is about 4627.7681445811. The cubic root of 21416238 is about 277.7033133852.

The spelling of 21416238 in words is "twenty-one million, four hundred sixteen thousand, two hundred thirty-eight".