1221222201137 has 2 divisors, whose sum is σ = 1221222201138. Its totient is φ = 1221222201136.

The previous prime is 1221222201131. The next prime is 1221222201187. The reversal of 1221222201137 is 7311022221221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197702604816 + 23519596321 = 1094396^2 + 153361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221222201137 - 2²⁰ = 1221221152561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221222201131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611100568 + 610611100569.

It is an arithmetic number, because the mean of its divisors is an integer number (610611100569).

Almost surely, 2^{1221222201137} is an apocalyptic number.

It is an amenable number.

1221222201137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222201137 is an equidigital number, since it uses as much as digits as its factorization.

1221222201137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 1221222201137 its reverse (7311022221221), we get a palindrome (8532244422358).

The spelling of 1221222201137 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, one hundred thirty-seven".