21025330 has 8 divisors (see below), whose sum is σ = 37845612. Its totient is φ = 8410128.

The previous prime is 21025321. The next prime is 21025339. The reversal of 21025330 is 3352012.

It is an interprime number because it is at equal distance from previous prime (21025321) and next prime (21025339).

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 259081 = 4557^2 + 509^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21025339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051257 + ... + 1051276.

Almost surely, 2^21025330 is an apocalyptic number.

21025330 is a deficient number, since it is larger than the sum of its proper divisors (16820282).

21025330 is a wasteful number, since it uses less digits than its factorization.

21025330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102540.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 21025330 is about 4585.3385916418. The cubic root of 21025330 is about 276.0032993374.

Adding to 21025330 its reverse (3352012), we get a palindrome (24377342).

The spelling of 21025330 in words is "twenty-one million, twenty-five thousand, three hundred thirty".