121221222002051 has 2 divisors, whose sum is σ = 121221222002052. Its totient is φ = 121221222002050.

The previous prime is 121221222002009. The next prime is 121221222002149. The reversal of 121221222002051 is 150200222122121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221222002051 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221222202051) 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, 60610611001025 + 60610611001026.

It is an arithmetic number, because the mean of its divisors is an integer number (60610611001026).

Almost surely, 2^{121221222002051} is an apocalyptic number.

121221222002051 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221222002051 is an equidigital number, since it uses as much as digits as its factorization.

121221222002051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 121221222002051 its reverse (150200222122121), we get a palindrome (271421444124172).

The spelling of 121221222002051 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, fifty-one".