121242101 has 2 divisors, whose sum is σ = 121242102. Its totient is φ = 121242100.

The previous prime is 121242083. The next prime is 121242137. The reversal of 121242101 is 101242121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104019601 + 17222500 = 10199^2 + 4150^2 .

It is an emirp because it is prime and its reverse (101242121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121242101 - 2¹⁰ = 121241077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121202101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621050 + 60621051.

It is an arithmetic number, because the mean of its divisors is an integer number (60621051).

Almost surely, 2^121242101 is an apocalyptic number.

It is an amenable number.

121242101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121242101 is an equidigital number, since it uses as much as digits as its factorization.

121242101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121242101 is about 11010.9990918172. Note that the first 3 decimals coincide. The cubic root of 121242101 is about 494.9384013408.

Adding to 121242101 its reverse (101242121), we get a palindrome (222484222).

The spelling of 121242101 in words is "one hundred twenty-one million, two hundred forty-two thousand, one hundred one".