121564111 has 4 divisors (see below), whose sum is σ = 121947912. Its totient is φ = 121180312.

The previous prime is 121564099. The next prime is 121564133. The reversal of 121564111 is 111465121.

It is a happy number.

121564111 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111465121 = 113 ⋅986417.

It is a cyclic number.

It is not a de Polignac number, because 121564111 - 2⁷ = 121563983 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 (121564511) 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, 191425 + ... + 192058.

It is an arithmetic number, because the mean of its divisors is an integer number (30486978).

Almost surely, 2^121564111 is an apocalyptic number.

121564111 is a deficient number, since it is larger than the sum of its proper divisors (383801).

121564111 is an equidigital number, since it uses as much as digits as its factorization.

121564111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383800.

The product of its digits is 240, while the sum is 22.

The square root of 121564111 is about 11025.6115930138. The cubic root of 121564111 is about 495.3761871841.

The spelling of 121564111 in words is "one hundred twenty-one million, five hundred sixty-four thousand, one hundred eleven".