111540233910121 has 3 divisors (see below), whose sum is σ = 111540244471383. Its totient is φ = 111540223348860.

The previous prime is 111540233910113. The next prime is 111540233910137. The reversal of 111540233910121 is 121019332045111.

The square root of 111540233910121 is 10561261.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 56412281877721 + 55127952032400 = 7510811^2 + 7424820^2 .

It is not a de Polignac number, because 111540233910121 - 2³ = 111540233910113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111540233916121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5280631 + ... + 15841891.

It is an arithmetic number, because the mean of its divisors is an integer number (37180081490461).

Almost surely, 2^{111540233910121} is an apocalyptic number.

111540233910121 is the 10561261-st square number.

111540233910121 is the 5280631-st centered octagonal number.

It is an amenable number.

111540233910121 is a deficient number, since it is larger than the sum of its proper divisors (10561262).

111540233910121 is an frugal number, since it uses more digits than its factorization.

111540233910121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122522 (or 10561261 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

Adding to 111540233910121 its reverse (121019332045111), we get a palindrome (232559565955232).

The spelling of 111540233910121 in words is "one hundred eleven trillion, five hundred forty billion, two hundred thirty-three million, nine hundred ten thousand, one hundred twenty-one".