21510243205093 has 16 divisors (see below), whose sum is σ = 23331326946480. Its totient is φ = 19750923878400.

The previous prime is 21510243205069. The next prime is 21510243205117. The reversal of 21510243205093 is 39050234201512.

It is an interprime number because it is at equal distance from previous prime (21510243205069) and next prime (21510243205117).

It can be written as a sum of positive squares in 8 ways, for example, as 6190706300769 + 15319536904324 = 2488113^2 + 3914018^2 .

It is a cyclic number.

It is not a de Polignac number, because 21510243205093 - 2²⁵ = 21510209650661 is a prime.

It is a super-2 number, since 2×21510243205093² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510243205063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95111893 + ... + 95337781.

It is an arithmetic number, because the mean of its divisors is an integer number (1458207934155).

Almost surely, 2^{21510243205093} is an apocalyptic number.

It is an amenable number.

21510243205093 is a deficient number, since it is larger than the sum of its proper divisors (1821083741387).

21510243205093 is a wasteful number, since it uses less digits than its factorization.

21510243205093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362568.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21510243205093 in words is "twenty-one trillion, five hundred ten billion, two hundred forty-three million, two hundred five thousand, ninety-three".