21034243213120 has 28 divisors (see below), whose sum is σ = 50087791652004. Its totient is φ = 8413697285120.

The previous prime is 21034243213043. The next prime is 21034243213157. The reversal of 21034243213120 is 2131234243012.

It can be written as a sum of positive squares in 2 ways, for example, as 14803348590144 + 6230894622976 = 3847512^2 + 2496176^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 32866004701 + ... + 32866005340.

Almost surely, 2^{21034243213120} is an apocalyptic number.

21034243213120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034243213120 is an abundant number, since it is smaller than the sum of its proper divisors (29053548438884).

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

21034243213120 is an equidigital number, since it uses as much as digits as its factorization.

21034243213120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65732010058 (or 65732010048 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21034243213120 its reverse (2131234243012), we get a palindrome (23165477456132).

The spelling of 21034243213120 in words is "twenty-one trillion, thirty-four billion, two hundred forty-three million, two hundred thirteen thousand, one hundred twenty".