21382750 has 16 divisors (see below), whose sum is σ = 40028976. Its totient is φ = 8553000.

The previous prime is 21382747. The next prime is 21382759. The reversal of 21382750 is 5728312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42516 + ... + 43015.

It is an arithmetic number, because the mean of its divisors is an integer number (2501811).

Almost surely, 2^21382750 is an apocalyptic number.

21382750 is a deficient number, since it is larger than the sum of its proper divisors (18646226).

21382750 is an equidigital number, since it uses as much as digits as its factorization.

21382750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85548 (or 85538 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21382750 is about 4624.1485702776. The cubic root of 21382750 is about 277.5584921204.

The spelling of 21382750 in words is "twenty-one million, three hundred eighty-two thousand, seven hundred fifty".