21251352 has 16 divisors (see below), whose sum is σ = 53128440. Its totient is φ = 7083776.

The previous prime is 21251339. The next prime is 21251353. The reversal of 21251352 is 25315212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251353) 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, 442713 + ... + 442760.

Almost surely, 2^21251352 is an apocalyptic number.

It is an amenable number.

21251352 is an abundant number, since it is smaller than the sum of its proper divisors (31877088).

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

21251352 is a wasteful number, since it uses less digits than its factorization.

21251352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885482 (or 885478 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 21251352 is about 4609.9188713035. The cubic root of 21251352 is about 276.9887869233.

Adding to 21251352 its reverse (25315212), we get a palindrome (46566564).

The spelling of 21251352 in words is "twenty-one million, two hundred fifty-one thousand, three hundred fifty-two".