1221222201131 has 2 divisors, whose sum is σ = 1221222201132. Its totient is φ = 1221222201130.

The previous prime is 1221222201127. The next prime is 1221222201137. The reversal of 1221222201131 is 1311022221221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221222201131 - 2² = 1221222201127 is a prime.

It is a super-2 number, since 2×1221222201131² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221222201137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611100565 + 610611100566.

It is an arithmetic number, because the mean of its divisors is an integer number (610611100566).

Almost surely, 2^{1221222201131} is an apocalyptic number.

1221222201131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222201131 is an equidigital number, since it uses as much as digits as its factorization.

1221222201131 is an evil number, because the sum of its binary digits is even.

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

Adding to 1221222201131 its reverse (1311022221221), we get a palindrome (2532244422352).

The spelling of 1221222201131 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, one hundred thirty-one".