21860850 has 48 divisors (see below), whose sum is σ = 59148000. Its totient is φ = 5299200.

The previous prime is 21860843. The next prime is 21860863. The reversal of 21860850 is 5806812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4975 + ... + 8274.

It is an arithmetic number, because the mean of its divisors is an integer number (1232250).

Almost surely, 2^21860850 is an apocalyptic number.

21860850 is an abundant number, since it is smaller than the sum of its proper divisors (37287150).

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

21860850 is a wasteful number, since it uses less digits than its factorization.

21860850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13275 (or 13270 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 21860850 is about 4675.5587901341. The cubic root of 21860850 is about 279.6119198522.

The spelling of 21860850 in words is "twenty-one million, eight hundred sixty thousand, eight hundred fifty".