21014252 has 12 divisors (see below), whose sum is σ = 42028560. Its totient is φ = 9006096.

The previous prime is 21014243. The next prime is 21014297. The reversal of 21014252 is 25241012.

21014252 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21014252.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375227 + ... + 375282.

It is an arithmetic number, because the mean of its divisors is an integer number (3502380).

Almost surely, 2^21014252 is an apocalyptic number.

It is an amenable number.

21014252 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.

21014252 is a wasteful number, since it uses less digits than its factorization.

21014252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750520 (or 750518 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21014252 is about 4584.1304518960. The cubic root of 21014252 is about 275.9548165200.

Adding to 21014252 its reverse (25241012), we get a palindrome (46255264).

The spelling of 21014252 in words is "twenty-one million, fourteen thousand, two hundred fifty-two".