21383750 has 20 divisors (see below), whose sum is σ = 40084044. Its totient is φ = 8553000.

The previous prime is 21383749. The next prime is 21383753. The reversal of 21383750 is 5738312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383753) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7304 + ... + 9803.

Almost surely, 2^21383750 is an apocalyptic number.

21383750 is a deficient number, since it is larger than the sum of its proper divisors (18700294).

21383750 is an equidigital number, since it uses as much as digits as its factorization.

21383750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17129 (or 17114 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21383750 is about 4624.2566970271. The cubic root of 21383750 is about 277.5628188817.

The spelling of 21383750 in words is "twenty-one million, three hundred eighty-three thousand, seven hundred fifty".