111121220131 has 4 divisors (see below), whose sum is σ = 115952577552. Its totient is φ = 106289862712.

The previous prime is 111121220129. The next prime is 111121220173. The reversal of 111121220131 is 131022121111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111121220131 - 2¹ = 111121220129 is a prime.

It is a super-2 number, since 2×111121220131² (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 (111121220731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2415678676 + ... + 2415678721.

It is an arithmetic number, because the mean of its divisors is an integer number (28988144388).

Almost surely, 2^111121220131 is an apocalyptic number.

111121220131 is a deficient number, since it is larger than the sum of its proper divisors (4831357421).

111121220131 is an equidigital number, since it uses as much as digits as its factorization.

111121220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4831357420.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111121220131 its reverse (131022121111), we get a palindrome (242143341242).

The spelling of 111121220131 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one hundred thirty-one".