21000325 has 12 divisors (see below), whose sum is σ = 26217568. Its totient is φ = 16686000.

The previous prime is 21000313. The next prime is 21000337. The reversal of 21000325 is 52300012.

It is an interprime number because it is at equal distance from previous prime (21000313) and next prime (21000337).

It is not a de Polignac number, because 21000325 - 2⁵ = 21000293 is a prime.

It is a Duffinian number.

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, 994 + ... + 6556.

Almost surely, 2^21000325 is an apocalyptic number.

21000325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21000325 is a deficient number, since it is larger than the sum of its proper divisors (5217243).

21000325 is a wasteful number, since it uses less digits than its factorization.

21000325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724 (or 5719 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 21000325 is about 4582.6111552258. The cubic root of 21000325 is about 275.8938408853.

Adding to 21000325 its reverse (52300012), we get a palindrome (73300337).

The spelling of 21000325 in words is "twenty-one million, three hundred twenty-five", and thus it is an aban number.