21013145093 has 4 divisors (see below), whose sum is σ = 21016555308. Its totient is φ = 21009734880.

The previous prime is 21013145081. The next prime is 21013145149. The reversal of 21013145093 is 39054131012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11405812804 + 9607332289 = 106798^2 + 98017^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013145093 - 2³² = 16718177797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013115093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695848 + ... + 1708193.

It is an arithmetic number, because the mean of its divisors is an integer number (5254138827).

Almost surely, 2^21013145093 is an apocalyptic number.

It is an amenable number.

21013145093 is a deficient number, since it is larger than the sum of its proper divisors (3410215).

21013145093 is an equidigital number, since it uses as much as digits as its factorization.

21013145093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410214.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 21013145093 in words is "twenty-one billion, thirteen million, one hundred forty-five thousand, ninety-three".