18211001121 has 8 divisors (see below), whose sum is σ = 26979260960. Its totient is φ = 12140667396.

The previous prime is 18211001113. The next prime is 18211001147. The reversal of 18211001121 is 12110011281.

It is not a de Polignac number, because 18211001121 - 2³ = 18211001113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18211001094 and 18211001103.

It is not an unprimeable number, because it can be changed into a prime (18211001161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337240735 + ... + 337240788.

It is an arithmetic number, because the mean of its divisors is an integer number (3372407620).

Almost surely, 2^18211001121 is an apocalyptic number.

It is an amenable number.

18211001121 is a deficient number, since it is larger than the sum of its proper divisors (8768259839).

18211001121 is an equidigital number, since it uses as much as digits as its factorization.

18211001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674481532 (or 674481526 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

The spelling of 18211001121 in words is "eighteen billion, two hundred eleven million, one thousand, one hundred twenty-one".