121242661 has 2 divisors, whose sum is σ = 121242662. Its totient is φ = 121242660.

The previous prime is 121242631. The next prime is 121242677. The reversal of 121242661 is 166242121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105884100 + 15358561 = 10290^2 + 3919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121242661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121242631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60621330 + 60621331.

It is an arithmetic number, because the mean of its divisors is an integer number (60621331).

Almost surely, 2^121242661 is an apocalyptic number.

It is an amenable number.

121242661 is a deficient number, since it is larger than the sum of its proper divisors (1).

121242661 is an equidigital number, since it uses as much as digits as its factorization.

121242661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 121242661 is about 11011.0245209063. The cubic root of 121242661 is about 494.9391633563.

Adding to 121242661 its reverse (166242121), we get a palindrome (287484782).

The spelling of 121242661 in words is "one hundred twenty-one million, two hundred forty-two thousand, six hundred sixty-one".