111121215655 has 12 divisors (see below), whose sum is σ = 133564215960. Its totient is φ = 88751372864.

The previous prime is 111121215629. The next prime is 111121215727. The reversal of 111121215655 is 556512121111.

It is a de Polignac number, because none of the positive numbers 2^k-111121215655 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1874256 + ... + 1932634.

It is an arithmetic number, because the mean of its divisors is an integer number (11130351330).

Almost surely, 2^111121215655 is an apocalyptic number.

111121215655 is a deficient number, since it is larger than the sum of its proper divisors (22443000305).

111121215655 is an frugal number, since it uses more digits than its factorization.

111121215655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59618 (or 59001 counting only the distinct ones).

The product of its digits is 3000, while the sum is 31.

Adding to 111121215655 its reverse (556512121111), we get a palindrome (667633336766).

The spelling of 111121215655 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred fifteen thousand, six hundred fifty-five".