121420109 has 2 divisors, whose sum is σ = 121420110. Its totient is φ = 121420108.

The previous prime is 121420043. The next prime is 121420111. The reversal of 121420109 is 901024121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108097609 + 13322500 = 10397^2 + 3650^2 .

It is a cyclic number.

It is not a de Polignac number, because 121420109 - 2¹⁶ = 121354573 is a prime.

Together with 121420111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121420009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710054 + 60710055.

It is an arithmetic number, because the mean of its divisors is an integer number (60710055).

Almost surely, 2^121420109 is an apocalyptic number.

It is an amenable number.

121420109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121420109 is an equidigital number, since it uses as much as digits as its factorization.

121420109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 121420109 is about 11019.0793172570. The cubic root of 121420109 is about 495.1805062192.

The spelling of 121420109 in words is "one hundred twenty-one million, four hundred twenty thousand, one hundred nine".