21063252 has 24 divisors (see below), whose sum is σ = 56168896. Its totient is φ = 6018048.

The previous prime is 21063233. The next prime is 21063253. The reversal of 21063252 is 25236012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063253) 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, 125293 + ... + 125460.

Almost surely, 2^21063252 is an apocalyptic number.

It is an amenable number.

21063252 is an abundant number, since it is smaller than the sum of its proper divisors (35105644).

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

21063252 is a wasteful number, since it uses less digits than its factorization.

21063252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250767 (or 250765 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21063252 is about 4589.4718650407. The cubic root of 21063252 is about 276.1691359859.

Adding to 21063252 its reverse (25236012), we get a palindrome (46299264).

The spelling of 21063252 in words is "twenty-one million, sixty-three thousand, two hundred fifty-two".