21123634245332 has 12 divisors (see below), whose sum is σ = 36966416678100. Its totient is φ = 10561800908736.

The previous prime is 21123634245271. The next prime is 21123634245409. The reversal of 21123634245332 is 23354243632112.

It can be written as a sum of positive squares in 2 ways, for example, as 19877740734916 + 1245893510416 = 4458446^2 + 1116196^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21123634245332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838913 + ... + 6553704.

It is an arithmetic number, because the mean of its divisors is an integer number (3080534723175).

Almost surely, 2^{21123634245332} is an apocalyptic number.

It is an amenable number.

21123634245332 is a deficient number, since it is larger than the sum of its proper divisors (15842782432768).

21123634245332 is a wasteful number, since it uses less digits than its factorization.

21123634245332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8106970 (or 8106968 counting only the distinct ones).

The product of its digits is 622080, while the sum is 41.

Adding to 21123634245332 its reverse (23354243632112), we get a palindrome (44477877877444).

The spelling of 21123634245332 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred thirty-four million, two hundred forty-five thousand, three hundred thirty-two".