21120424515293 has 2 divisors, whose sum is σ = 21120424515294. Its totient is φ = 21120424515292.

The previous prime is 21120424515233. The next prime is 21120424515371. The reversal of 21120424515293 is 39251542402112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20418351456889 + 702073058404 = 4518667^2 + 837898^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120424515293 - 2¹⁰ = 21120424514269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120424515293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120424515233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560212257646 + 10560212257647.

It is an arithmetic number, because the mean of its divisors is an integer number (10560212257647).

Almost surely, 2^{21120424515293} is an apocalyptic number.

It is an amenable number.

21120424515293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120424515293 is an equidigital number, since it uses as much as digits as its factorization.

21120424515293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 21120424515293 in words is "twenty-one trillion, one hundred twenty billion, four hundred twenty-four million, five hundred fifteen thousand, two hundred ninety-three".