1221022221131 has 2 divisors, whose sum is σ = 1221022221132. Its totient is φ = 1221022221130.

The previous prime is 1221022221091. The next prime is 1221022221149. The reversal of 1221022221131 is 1311222201221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221022221131 - 2²² = 1221018026827 is a prime.

It is a super-2 number, since 2×1221022221131² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221022226131) 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, 610511110565 + 610511110566.

It is an arithmetic number, because the mean of its divisors is an integer number (610511110566).

Almost surely, 2^{1221022221131} is an apocalyptic number.

1221022221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221022221131 is an equidigital number, since it uses as much as digits as its factorization.

1221022221131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221022221131 its reverse (1311222201221), we get a palindrome (2532244422352).

The spelling of 1221022221131 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred thirty-one".