121101212111 has 4 divisors (see below), whose sum is σ = 132110413224. Its totient is φ = 110092011000.

The previous prime is 121101212009. The next prime is 121101212119. The reversal of 121101212111 is 111212101121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121101212111 - 2¹⁰ = 121101211087 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 (121101212119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5504600540 + ... + 5504600561.

It is an arithmetic number, because the mean of its divisors is an integer number (33027603306).

Almost surely, 2^121101212111 is an apocalyptic number.

121101212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121101212111 is a deficient number, since it is larger than the sum of its proper divisors (11009201113).

121101212111 is a wasteful number, since it uses less digits than its factorization.

121101212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11009201112.

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

Adding to 121101212111 its reverse (111212101121), we get a palindrome (232313313232).

It can be divided in two parts, 12110 and 1212111, that added together give a palindrome (1224221).

The spelling of 121101212111 in words is "one hundred twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred eleven".