21860316 has 36 divisors (see below), whose sum is σ = 57166200. Its totient is φ = 7035168.

The previous prime is 21860273. The next prime is 21860323. The reversal of 21860316 is 61306812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21860316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9426 + ... + 11513.

It is an arithmetic number, because the mean of its divisors is an integer number (1587950).

Almost surely, 2^21860316 is an apocalyptic number.

It is an amenable number.

21860316 is an abundant number, since it is smaller than the sum of its proper divisors (35305884).

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

21860316 is a wasteful number, since it uses less digits than its factorization.

21860316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20978 (or 20973 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21860316 is about 4675.5016843115. The cubic root of 21860316 is about 279.6096431188.

The spelling of 21860316 in words is "twenty-one million, eight hundred sixty thousand, three hundred sixteen".