121122120111 has 4 divisors (see below), whose sum is σ = 161496160152. Its totient is φ = 80748080072.

The previous prime is 121122120103. The next prime is 121122120137. The reversal of 121122120111 is 111021221121.

It is a happy number.

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 121122120111 - 2³ = 121122120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122120311) 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, 20187020016 + ... + 20187020021.

It is an arithmetic number, because the mean of its divisors is an integer number (40374040038).

Almost surely, 2^121122120111 is an apocalyptic number.

121122120111 is a deficient number, since it is larger than the sum of its proper divisors (40374040041).

121122120111 is an equidigital number, since it uses as much as digits as its factorization.

121122120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40374040040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121122120111 its reverse (111021221121), we get a palindrome (232143341232).

The spelling of 121122120111 in words is "one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred eleven".