121642111 has 2 divisors, whose sum is σ = 121642112. Its totient is φ = 121642110.

The previous prime is 121642091. The next prime is 121642139. The reversal of 121642111 is 111246121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121642111 - 2²⁵ = 88087679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121642151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60821055 + 60821056.

It is an arithmetic number, because the mean of its divisors is an integer number (60821056).

Almost surely, 2^121642111 is an apocalyptic number.

121642111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121642111 is an equidigital number, since it uses as much as digits as its factorization.

121642111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 19.

The square root of 121642111 is about 11029.1482445382. The cubic root of 121642111 is about 495.4821150523.

Adding to 121642111 its reverse (111246121), we get a palindrome (232888232).

The spelling of 121642111 in words is "one hundred twenty-one million, six hundred forty-two thousand, one hundred eleven".