111212121111101 has 16 divisors (see below), whose sum is σ = 115257636990000. Its totient is φ = 107180659880448.

The previous prime is 111212121111089. The next prime is 111212121111131. The reversal of 111212121111101 is 101111121212111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1984644183076 + 109227476928025 = 1408774^2 + 10451195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111212121111101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111212121111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212121111131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528889481 + ... + 529099713.

It is an arithmetic number, because the mean of its divisors is an integer number (7203602311875).

Almost surely, 2^{111212121111101} is an apocalyptic number.

It is an amenable number.

111212121111101 is a deficient number, since it is larger than the sum of its proper divisors (4045515878899).

111212121111101 is a wasteful number, since it uses less digits than its factorization.

111212121111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243568.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111212121111101 its reverse (101111121212111), we get a palindrome (212323242323212).

The spelling of 111212121111101 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred one".