21102452 has 12 divisors (see below), whose sum is σ = 42204960. Its totient is φ = 9043896.

The previous prime is 21102451. The next prime is 21102463. The reversal of 21102452 is 25420112.

21102452 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21102452.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102451) 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, 376802 + ... + 376857.

It is an arithmetic number, because the mean of its divisors is an integer number (3517080).

Almost surely, 2^21102452 is an apocalyptic number.

It is an amenable number.

21102452 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.

21102452 is a wasteful number, since it uses less digits than its factorization.

21102452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753670 (or 753668 counting only the distinct ones).

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

The square root of 21102452 is about 4593.7405237997. The cubic root of 21102452 is about 276.3403523650.

Adding to 21102452 its reverse (25420112), we get a palindrome (46522564).

The spelling of 21102452 in words is "twenty-one million, one hundred two thousand, four hundred fifty-two".