21301252 has 12 divisors (see below), whose sum is σ = 42602560. Its totient is φ = 9129096.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301252 is 25210312.

21301252 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21301253) 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, 380352 + ... + 380407.

Almost surely, 2^21301252 is an apocalyptic number.

It is an amenable number.

21301252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301252 is a wasteful number, since it uses less digits than its factorization.

21301252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760770 (or 760768 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21301252 is about 4615.3279406777. The cubic root of 21301252 is about 277.2054152794.

Adding to 21301252 its reverse (25210312), we get a palindrome (46511564).

The spelling of 21301252 in words is "twenty-one million, three hundred one thousand, two hundred fifty-two".