121420121 has 2 divisors, whose sum is σ = 121420122. Its totient is φ = 121420120.

The previous prime is 121420111. The next prime is 121420133. The reversal of 121420121 is 121024121.

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., 116402521 + 5017600 = 10789^2 + 2240^2 .

It is an emirp because it is prime and its reverse (121024121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121420121 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121420096 and 121420105.

It is not a weakly prime, because it can be changed into another prime (121420111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710060 + 60710061.

It is an arithmetic number, because the mean of its divisors is an integer number (60710061).

Almost surely, 2^121420121 is an apocalyptic number.

It is an amenable number.

121420121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121420121 is an equidigital number, since it uses as much as digits as its factorization.

121420121 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 121420121 is about 11019.0798617670. The cubic root of 121420121 is about 495.1805225322.

Adding to 121420121 its reverse (121024121), we get a palindrome (242444242).

The spelling of 121420121 in words is "one hundred twenty-one million, four hundred twenty thousand, one hundred twenty-one".