111131020221 has 32 divisors (see below), whose sum is σ = 160030590720. Its totient is φ = 68192409600.

The previous prime is 111131020213. The next prime is 111131020223. The reversal of 111131020221 is 122020131111.

It is not a de Polignac number, because 111131020221 - 2³ = 111131020213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111131020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111131020223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22859331 + ... + 22864191.

It is an arithmetic number, because the mean of its divisors is an integer number (5000955960).

Almost surely, 2^111131020221 is an apocalyptic number.

It is an amenable number.

111131020221 is a deficient number, since it is larger than the sum of its proper divisors (48899570499).

111131020221 is a wasteful number, since it uses less digits than its factorization.

111131020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6437.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 111131020221 its reverse (122020131111), we get a palindrome (233151151332).

The spelling of 111131020221 in words is "one hundred eleven billion, one hundred thirty-one million, twenty thousand, two hundred twenty-one".