2161111423521 has 8 divisors (see below), whose sum is σ = 2881639696320. Its totient is φ = 1440662049872.

The previous prime is 2161111423483. The next prime is 2161111423531. The reversal of 2161111423521 is 1253241111612.

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 2161111423521 - 2²⁵ = 2161077869089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161111423531) 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, 19660845 + ... + 19770458.

It is an arithmetic number, because the mean of its divisors is an integer number (360204962040).

Almost surely, 2^{2161111423521} is an apocalyptic number.

It is an amenable number.

2161111423521 is a deficient number, since it is larger than the sum of its proper divisors (720528272799).

2161111423521 is a wasteful number, since it uses less digits than its factorization.

2161111423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39449575.

The product of its digits is 2880, while the sum is 30.

The spelling of 2161111423521 in words is "two trillion, one hundred sixty-one billion, one hundred eleven million, four hundred twenty-three thousand, five hundred twenty-one".