121342522111 has 4 divisors (see below), whose sum is σ = 121343222392. Its totient is φ = 121341821832.

The previous prime is 121342522099. The next prime is 121342522121. The reversal of 121342522111 is 111225243121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 111225243121 = 3989 ⋅27882989.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121342522111 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 (121342522121) 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, 121921 + ... + 507493.

It is an arithmetic number, because the mean of its divisors is an integer number (30335805598).

Almost surely, 2^121342522111 is an apocalyptic number.

121342522111 is a deficient number, since it is larger than the sum of its proper divisors (700281).

121342522111 is an equidigital number, since it uses as much as digits as its factorization.

121342522111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700280.

The product of its digits is 960, while the sum is 25.

Adding to 121342522111 its reverse (111225243121), we get a palindrome (232567765232).

The spelling of 121342522111 in words is "one hundred twenty-one billion, three hundred forty-two million, five hundred twenty-two thousand, one hundred eleven".