21124002452 has 48 divisors (see below), whose sum is σ = 44095145472. Its totient is φ = 8665662720.

The previous prime is 21124002451. The next prime is 21124002479. The reversal of 21124002452 is 25420042112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124002451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112748 + ... + 234435.

It is an arithmetic number, because the mean of its divisors is an integer number (918648864).

Almost surely, 2^21124002452 is an apocalyptic number.

It is an amenable number.

21124002452 is an abundant number, since it is smaller than the sum of its proper divisors (22971143020).

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

21124002452 is a wasteful number, since it uses less digits than its factorization.

21124002452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347288 (or 347286 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21124002452 its reverse (25420042112), we get a palindrome (46544044564).

The spelling of 21124002452 in words is "twenty-one billion, one hundred twenty-four million, two thousand, four hundred fifty-two".