21150325 has 24 divisors (see below), whose sum is σ = 31555520. Its totient is φ = 13737600.

The previous prime is 21150313. The next prime is 21150331. The reversal of 21150325 is 52305112.

It is not a de Polignac number, because 21150325 - 2⁵ = 21150293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145 + ... + 6505.

Almost surely, 2^21150325 is an apocalyptic number.

21150325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150325 is a deficient number, since it is larger than the sum of its proper divisors (10405195).

21150325 is a wasteful number, since it uses less digits than its factorization.

21150325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6397 (or 6392 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21150325 is about 4598.9482493283. The cubic root of 21150325 is about 276.5491630178.

Adding to 21150325 its reverse (52305112), we get a palindrome (73455437).

The spelling of 21150325 in words is "twenty-one million, one hundred fifty thousand, three hundred twenty-five".