18913132001221 has 8 divisors (see below), whose sum is σ = 19026227928960. Its totient is φ = 18800191748352.

The previous prime is 18913132001213. The next prime is 18913132001233. The reversal of 18913132001221 is 12210023131981.

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

It is a cyclic number.

It is not a de Polignac number, because 18913132001221 - 2³ = 18913132001213 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 (18913132005221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38675005 + ... + 39160978.

It is an arithmetic number, because the mean of its divisors is an integer number (2378278491120).

Almost surely, 2^{18913132001221} is an apocalyptic number.

It is an amenable number.

18913132001221 is a deficient number, since it is larger than the sum of its proper divisors (113095927739).

18913132001221 is a wasteful number, since it uses less digits than its factorization.

18913132001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77837435.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 18913132001221 in words is "eighteen trillion, nine hundred thirteen billion, one hundred thirty-two million, one thousand, two hundred twenty-one".