21201252 has 24 divisors (see below), whose sum is σ = 49681632. Its totient is φ = 7036800.

The previous prime is 21201251. The next prime is 21201281. The reversal of 21201252 is 25210212.

It is not an unprimeable number, because it can be changed into a prime (21201251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (2070068).

Almost surely, 2^21201252 is an apocalyptic number.

It is an amenable number.

21201252 is an abundant number, since it is smaller than the sum of its proper divisors (28480380).

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

21201252 is a wasteful number, since it uses less digits than its factorization.

21201252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7579 (or 7577 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21201252 is about 4604.4817297933. The cubic root of 21201252 is about 276.7709488985.

Adding to 21201252 its reverse (25210212), we get a palindrome (46411464).

The spelling of 21201252 in words is "twenty-one million, two hundred one thousand, two hundred fifty-two".