18929371213 has 4 divisors (see below), whose sum is σ = 19332123840. Its totient is φ = 18526618588.

The previous prime is 18929371211. The next prime is 18929371247. The reversal of 18929371213 is 31217392981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18929371213 - 2¹ = 18929371211 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 (18929371211) 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, 201376243 + ... + 201376336.

It is an arithmetic number, because the mean of its divisors is an integer number (4833030960).

Almost surely, 2^18929371213 is an apocalyptic number.

It is an amenable number.

18929371213 is a deficient number, since it is larger than the sum of its proper divisors (402752627).

18929371213 is an equidigital number, since it uses as much as digits as its factorization.

18929371213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402752626.

The product of its digits is 163296, while the sum is 46.

The spelling of 18929371213 in words is "eighteen billion, nine hundred twenty-nine million, three hundred seventy-one thousand, two hundred thirteen".