21052453332 has 24 divisors (see below), whose sum is σ = 49608754272. Its totient is φ = 6948004000.

The previous prime is 21052453327. The next prime is 21052453339. The reversal of 21052453332 is 23335425012.

It is a self number, because there is not a number n which added to its sum of digits gives 21052453332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052453339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8683794 + ... + 8686217.

It is an arithmetic number, because the mean of its divisors is an integer number (2067031428).

Almost surely, 2^21052453332 is an apocalyptic number.

It is an amenable number.

21052453332 is an abundant number, since it is smaller than the sum of its proper divisors (28556300940).

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

21052453332 is a wasteful number, since it uses less digits than its factorization.

21052453332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17370119 (or 17370117 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 21052453332 its reverse (23335425012), we get a palindrome (44387878344).

The spelling of 21052453332 in words is "twenty-one billion, fifty-two million, four hundred fifty-three thousand, three hundred thirty-two".