121220221147 has 2 divisors, whose sum is σ = 121220221148. Its totient is φ = 121220221146.

The previous prime is 121220221091. The next prime is 121220221169. The reversal of 121220221147 is 741122022121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121220221147 - 2³¹ = 119072737499 is a prime.

It is a super-4 number, since 4×121220221147⁴ (a number of 45 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (121220221247) 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, 60610110573 + 60610110574.

It is an arithmetic number, because the mean of its divisors is an integer number (60610110574).

Almost surely, 2^121220221147 is an apocalyptic number.

121220221147 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220221147 is an equidigital number, since it uses as much as digits as its factorization.

121220221147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

Adding to 121220221147 its reverse (741122022121), we get a palindrome (862342243268).

It can be divided in two parts, 12122022114 and 7, that added together give a palindrome (12122022121).

The spelling of 121220221147 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred forty-seven".