181120021002021 has 32 divisors (see below), whose sum is σ = 252354215393280. Its totient is φ = 115331319601344.

The previous prime is 181120021002013. The next prime is 181120021002031. The reversal of 181120021002021 is 120200120021181.

It is not a de Polignac number, because 181120021002021 - 2³ = 181120021002013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181120021002031) 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 31 ways as a sum of consecutive naturals, for example, 959975331 + ... + 960163983.

It is an arithmetic number, because the mean of its divisors is an integer number (7886069231040).

Almost surely, 2^{181120021002021} is an apocalyptic number.

It is an amenable number.

181120021002021 is a deficient number, since it is larger than the sum of its proper divisors (71234194391259).

181120021002021 is a wasteful number, since it uses less digits than its factorization.

181120021002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208545.

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 181120021002021 in words is "one hundred eighty-one trillion, one hundred twenty billion, twenty-one million, two thousand, twenty-one".