21860364 has 24 divisors (see below), whose sum is σ = 51106048. Its totient is φ = 7272720.

The previous prime is 21860353. The next prime is 21860381. The reversal of 21860364 is 46306812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6129 + ... + 9015.

Almost surely, 2^21860364 is an apocalyptic number.

It is an amenable number.

21860364 is an abundant number, since it is smaller than the sum of its proper divisors (29245684).

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

21860364 is a wasteful number, since it uses less digits than its factorization.

21860364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525 (or 3523 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 21860364 is about 4675.5068174477. The cubic root of 21860364 is about 279.6098477705.

The spelling of 21860364 in words is "twenty-one million, eight hundred sixty thousand, three hundred sixty-four".