121111220111 has 8 divisors (see below), whose sum is σ = 138414944544. Its totient is φ = 103808026080.

The previous prime is 121111220107. The next prime is 121111220147. The reversal of 121111220111 is 111022111121.

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

It is a cyclic number.

It is not a de Polignac number, because 121111220111 - 2² = 121111220107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111220411) 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, 736301 + ... + 885641.

It is an arithmetic number, because the mean of its divisors is an integer number (17301868068).

Almost surely, 2^121111220111 is an apocalyptic number.

121111220111 is a deficient number, since it is larger than the sum of its proper divisors (17303724433).

121111220111 is a wasteful number, since it uses less digits than its factorization.

121111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265201.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121111220111 its reverse (111022111121), we get a palindrome (232133331232).

The spelling of 121111220111 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".