21802416 has 40 divisors (see below), whose sum is σ = 56506800. Its totient is φ = 7243776.

The previous prime is 21802411. The next prime is 21802439. The reversal of 21802416 is 61420812.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21802411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20260 + ... + 21308.

It is an arithmetic number, because the mean of its divisors is an integer number (1412670).

Almost surely, 2^21802416 is an apocalyptic number.

It is an amenable number.

21802416 is an abundant number, since it is smaller than the sum of its proper divisors (34704384).

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

21802416 is a wasteful number, since it uses less digits than its factorization.

21802416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1487 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 21802416 is about 4669.3057299774. The cubic root of 21802416 is about 279.3625635451.

The spelling of 21802416 in words is "twenty-one million, eight hundred two thousand, four hundred sixteen".