121220221051 has 2 divisors, whose sum is σ = 121220221052. Its totient is φ = 121220221050.

The previous prime is 121220221049. The next prime is 121220221091. The reversal of 121220221051 is 150122022121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220221051 - 2¹ = 121220221049 is a prime.

Together with 121220221049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121220221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610110525 + 60610110526.

It is an arithmetic number, because the mean of its divisors is an integer number (60610110526).

Almost surely, 2^121220221051 is an apocalyptic number.

121220221051 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220221051 is an equidigital number, since it uses as much as digits as its factorization.

121220221051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 121220221051 its reverse (150122022121), we get a palindrome (271342243172).

The spelling of 121220221051 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, fifty-one".