21856150 has 24 divisors (see below), whose sum is σ = 40827744. Its totient is φ = 8704800.

The previous prime is 21856139. The next prime is 21856151. The reversal of 21856150 is 5165812.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21856151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12744 + ... + 14356.

It is an arithmetic number, because the mean of its divisors is an integer number (1701156).

Almost surely, 2^21856150 is an apocalyptic number.

21856150 is a deficient number, since it is larger than the sum of its proper divisors (18971594).

21856150 is a wasteful number, since it uses less digits than its factorization.

21856150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 21856150 is about 4675.0561493954. The cubic root of 21856150 is about 279.5918799145.

The spelling of 21856150 in words is "twenty-one million, eight hundred fifty-six thousand, one hundred fifty".