18211001001 has 8 divisors (see below), whose sum is σ = 25709648544. Its totient is φ = 11426510400.

The previous prime is 18211000999. The next prime is 18211001027. The reversal of 18211001001 is 10010011281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18211001001 - 2¹ = 18211000999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18211001051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178539175 + ... + 178539276.

It is an arithmetic number, because the mean of its divisors is an integer number (3213706068).

Almost surely, 2^18211001001 is an apocalyptic number.

It is an amenable number.

18211001001 is a deficient number, since it is larger than the sum of its proper divisors (7498647543).

18211001001 is a wasteful number, since it uses less digits than its factorization.

18211001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357078471.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 18211001001 its reverse (10010011281), we get a palindrome (28221012282).

The spelling of 18211001001 in words is "eighteen billion, two hundred eleven million, one thousand, one".