21050325 has 18 divisors (see below), whose sum is σ = 37703874. Its totient is φ = 11226720.

The previous prime is 21050311. The next prime is 21050339. The reversal of 21050325 is 52305012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21050311) and next prime (21050339).

It can be written as a sum of positive squares in 3 ways, for example, as 338724 + 20711601 = 582^2 + 4551^2 .

It is not a de Polignac number, because 21050325 - 2⁹ = 21049813 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21050298 and 21050307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46554 + ... + 47003.

Almost surely, 2^21050325 is an apocalyptic number.

21050325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21050325 is a deficient number, since it is larger than the sum of its proper divisors (16653549).

21050325 is a wasteful number, since it uses less digits than its factorization.

21050325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93573 (or 93565 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21050325 is about 4588.0633169127. The cubic root of 21050325 is about 276.1126273168.

Adding to 21050325 its reverse (52305012), we get a palindrome (73355337).

The spelling of 21050325 in words is "twenty-one million, fifty thousand, three hundred twenty-five".