18211211013 has 4 divisors (see below), whose sum is σ = 24281614688. Its totient is φ = 12140807340.

The previous prime is 18211210999. The next prime is 18211211017. The reversal of 18211211013 is 31011211281.

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 not a de Polignac number, because 18211211013 - 2⁵ = 18211210981 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 (18211211017) 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, 3035201833 + ... + 3035201838.

It is an arithmetic number, because the mean of its divisors is an integer number (6070403672).

Almost surely, 2^18211211013 is an apocalyptic number.

It is an amenable number.

18211211013 is a deficient number, since it is larger than the sum of its proper divisors (6070403675).

18211211013 is an equidigital number, since it uses as much as digits as its factorization.

18211211013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070403674.

The product of its (nonzero) digits is 96, while the sum is 21.

Adding to 18211211013 its reverse (31011211281), we get a palindrome (49222422294).

The spelling of 18211211013 in words is "eighteen billion, two hundred eleven million, two hundred eleven thousand, thirteen".