111220221131 has 16 divisors (see below), whose sum is σ = 121128000000. Its totient is φ = 101718874656.

The previous prime is 111220221127. The next prime is 111220221143. The reversal of 111220221131 is 131122022111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111220221131 - 2² = 111220221127 is a prime.

It is a super-2 number, since 2×111220221131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111220221121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7706240 + ... + 7720658.

It is an arithmetic number, because the mean of its divisors is an integer number (7570500000).

Almost surely, 2^111220221131 is an apocalyptic number.

111220221131 is a deficient number, since it is larger than the sum of its proper divisors (9907778869).

111220221131 is a wasteful number, since it uses less digits than its factorization.

111220221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28466.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111220221131 its reverse (131122022111), we get a palindrome (242342243242).

The spelling of 111220221131 in words is "one hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, one hundred thirty-one".