121200122111 has 4 divisors (see below), whose sum is σ = 121703027424. Its totient is φ = 120697216800.

The previous prime is 121200122107. The next prime is 121200122117. The reversal of 121200122111 is 111221002121.

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 121200122111 - 2² = 121200122107 is a prime.

It is a super-2 number, since 2×121200122111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200122117) 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, 251452295 + ... + 251452776.

It is an arithmetic number, because the mean of its divisors is an integer number (30425756856).

Almost surely, 2^121200122111 is an apocalyptic number.

121200122111 is a deficient number, since it is larger than the sum of its proper divisors (502905313).

121200122111 is an equidigital number, since it uses as much as digits as its factorization.

121200122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502905312.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121200122111 its reverse (111221002121), we get a palindrome (232421124232).

The spelling of 121200122111 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-two thousand, one hundred eleven".