111531745221 has 64 divisors (see below), whose sum is σ = 168370513920. Its totient is φ = 65192359680.

The previous prime is 111531745187. The next prime is 111531745301. The reversal of 111531745221 is 122547135111.

It is not a de Polignac number, because 111531745221 - 2¹⁰ = 111531744197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111531745121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45208230 + ... + 45210696.

It is an arithmetic number, because the mean of its divisors is an integer number (2630789280).

Almost surely, 2^111531745221 is an apocalyptic number.

It is an amenable number.

111531745221 is a deficient number, since it is larger than the sum of its proper divisors (56838768699).

111531745221 is a wasteful number, since it uses less digits than its factorization.

111531745221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146.

The product of its digits is 8400, while the sum is 33.

The spelling of 111531745221 in words is "one hundred eleven billion, five hundred thirty-one million, seven hundred forty-five thousand, two hundred twenty-one".