121221851 has 2 divisors, whose sum is σ = 121221852. Its totient is φ = 121221850.

The previous prime is 121221839. The next prime is 121221857. The reversal of 121221851 is 158122121.

It is a strong prime.

It is an emirp because it is prime and its reverse (158122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221851 - 2¹⁴ = 121205467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121221857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610925 + 60610926.

It is an arithmetic number, because the mean of its divisors is an integer number (60610926).

Almost surely, 2^121221851 is an apocalyptic number.

121221851 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221851 is an equidigital number, since it uses as much as digits as its factorization.

121221851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 23.

The square root of 121221851 is about 11010.0795183323. The cubic root of 121221851 is about 494.9108447396.

Adding to 121221851 its reverse (158122121), we get a palindrome (279343972).

The spelling of 121221851 in words is "one hundred twenty-one million, two hundred twenty-one thousand, eight hundred fifty-one".