21875750 has 64 divisors (see below), whose sum is σ = 45287424. Its totient is φ = 7862400.

The previous prime is 21875747. The next prime is 21875767. The reversal of 21875750 is 5757812.

It is a self number, because there is not a number n which added to its sum of digits gives 21875750.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172187 + ... + 172313.

It is an arithmetic number, because the mean of its divisors is an integer number (707616).

Almost surely, 2^21875750 is an apocalyptic number.

21875750 is an abundant number, since it is smaller than the sum of its proper divisors (23411674).

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

21875750 is a wasteful number, since it uses less digits than its factorization.

21875750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 21875750 is about 4677.1519111528. The cubic root of 21875750 is about 279.6754317379.

The spelling of 21875750 in words is "twenty-one million, eight hundred seventy-five thousand, seven hundred fifty".