113220123561 has 12 divisors (see below), whose sum is σ = 163792953792. Its totient is φ = 75363416856.

The previous prime is 113220123551. The next prime is 113220123563. The reversal of 113220123561 is 165321022311.

It is not a de Polignac number, because 113220123561 - 2²² = 113215929257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (113220123563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9715981 + ... + 9727626.

It is an arithmetic number, because the mean of its divisors is an integer number (13649412816).

Almost surely, 2^113220123561 is an apocalyptic number.

It is an amenable number.

113220123561 is a deficient number, since it is larger than the sum of its proper divisors (50572830231).

113220123561 is a wasteful number, since it uses less digits than its factorization.

113220123561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19444260 (or 19444257 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 113220123561 its reverse (165321022311), we get a palindrome (278541145872).

The spelling of 113220123561 in words is "one hundred thirteen billion, two hundred twenty million, one hundred twenty-three thousand, five hundred sixty-one".