18011120213221 has 4 divisors (see below), whose sum is σ = 18012138786592. Its totient is φ = 18010101639852.

The previous prime is 18011120213167. The next prime is 18011120213231. The reversal of 18011120213221 is 12231202111081.

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 18011120213221 - 2¹⁵ = 18011120180453 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 (18011120213231) 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 3 ways as a sum of consecutive naturals, for example, 509260161 + ... + 509295526.

It is an arithmetic number, because the mean of its divisors is an integer number (4503034696648).

Almost surely, 2^{18011120213221} is an apocalyptic number.

It is an amenable number.

18011120213221 is a deficient number, since it is larger than the sum of its proper divisors (1018573371).

18011120213221 is a wasteful number, since it uses less digits than its factorization.

18011120213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018573370.

The product of its (nonzero) digits is 384, while the sum is 25.

The spelling of 18011120213221 in words is "eighteen trillion, eleven billion, one hundred twenty million, two hundred thirteen thousand, two hundred twenty-one".