21190750 has 32 divisors (see below), whose sum is σ = 45339840. Its totient is φ = 7264800.

The previous prime is 21190747. The next prime is 21190753. The reversal of 21190750 is 5709112.

It is an interprime number because it is at equal distance from previous prime (21190747) and next prime (21190753).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4305 + ... + 7804.

It is an arithmetic number, because the mean of its divisors is an integer number (1416870).

Almost surely, 2^21190750 is an apocalyptic number.

21190750 is an abundant number, since it is smaller than the sum of its proper divisors (24149090).

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

21190750 is a wasteful number, since it uses less digits than its factorization.

21190750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133 (or 12123 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 21190750 is about 4603.3411778837. The cubic root of 21190750 is about 276.7252420290.

Adding to 21190750 its reverse (5709112), we get a palindrome (26899862).

The spelling of 21190750 in words is "twenty-one million, one hundred ninety thousand, seven hundred fifty".