21325750 has 16 divisors (see below), whose sum is σ = 39922272. Its totient is φ = 8530200.

The previous prime is 21325739. The next prime is 21325757. The reversal of 21325750 is 5752312.

It is a super-2 number, since 2×21325750² = 909575226125000, which contains 22 as substring.

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

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325757) 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, 42402 + ... + 42901.

It is an arithmetic number, because the mean of its divisors is an integer number (2495142).

Almost surely, 2^21325750 is an apocalyptic number.

21325750 is a deficient number, since it is larger than the sum of its proper divisors (18596522).

21325750 is an equidigital number, since it uses as much as digits as its factorization.

21325750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85320 (or 85310 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 21325750 is about 4617.9811606372. The cubic root of 21325750 is about 277.3116434102.

The spelling of 21325750 in words is "twenty-one million, three hundred twenty-five thousand, seven hundred fifty".