21903325 has 12 divisors (see below), whose sum is σ = 27269460. Its totient is φ = 17452160.

The previous prime is 21903319. The next prime is 21903341. The reversal of 21903325 is 52330912.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 917764 + 20985561 = 958^2 + 4581^2 .

It is not a de Polignac number, because 21903325 - 2⁷ = 21903197 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21903325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5097 + ... + 8353.

It is an arithmetic number, because the mean of its divisors is an integer number (2272455).

Almost surely, 2^21903325 is an apocalyptic number.

21903325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21903325 is a deficient number, since it is larger than the sum of its proper divisors (5366135).

21903325 is a wasteful number, since it uses less digits than its factorization.

21903325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536 (or 3531 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21903325 is about 4680.0988237429. The cubic root of 21903325 is about 279.7928953202.

The spelling of 21903325 in words is "twenty-one million, nine hundred three thousand, three hundred twenty-five".