1220121220291 has 2 divisors, whose sum is σ = 1220121220292. Its totient is φ = 1220121220290.

The previous prime is 1220121220243. The next prime is 1220121220303. The reversal of 1220121220291 is 1920221210221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220121220291 - 2⁷ = 1220121220163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220121220231) 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, 610060610145 + 610060610146.

It is an arithmetic number, because the mean of its divisors is an integer number (610060610146).

Almost surely, 2^{1220121220291} is an apocalyptic number.

1220121220291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121220291 is an equidigital number, since it uses as much as digits as its factorization.

1220121220291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 1220121220291 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred ninety-one".