120121220251 has 2 divisors, whose sum is σ = 120121220252. Its totient is φ = 120121220250.

The previous prime is 120121220179. The next prime is 120121220287. The reversal of 120121220251 is 152022121021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 120121220251 - 2⁷ = 120121220123 is a prime.

It is not a weakly prime, because it can be changed into another prime (120121220951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60060610125 + 60060610126.

It is an arithmetic number, because the mean of its divisors is an integer number (60060610126).

Almost surely, 2^120121220251 is an apocalyptic number.

120121220251 is a deficient number, since it is larger than the sum of its proper divisors (1).

120121220251 is an equidigital number, since it uses as much as digits as its factorization.

120121220251 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 120121220251 its reverse (152022121021), we get a palindrome (272143341272).

The spelling of 120121220251 in words is "one hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred fifty-one".