111561421241 has 8 divisors (see below), whose sum is σ = 111905263080. Its totient is φ = 111217655808.

The previous prime is 111561421229. The next prime is 111561421291. The reversal of 111561421241 is 142124165111.

It can be written as a sum of positive squares in 4 ways, for example, as 8189526016 + 103371895225 = 90496^2 + 321515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111561421241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111561421291) 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, 4603805 + ... + 4627973.

It is an arithmetic number, because the mean of its divisors is an integer number (13988157885).

Almost surely, 2^111561421241 is an apocalyptic number.

It is an amenable number.

111561421241 is a deficient number, since it is larger than the sum of its proper divisors (343841839).

111561421241 is a wasteful number, since it uses less digits than its factorization.

111561421241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38203.

The product of its digits is 1920, while the sum is 29.

Adding to 111561421241 its reverse (142124165111), we get a palindrome (253685586352).

The spelling of 111561421241 in words is "one hundred eleven billion, five hundred sixty-one million, four hundred twenty-one thousand, two hundred forty-one".