1211201222137 has 2 divisors, whose sum is σ = 1211201222138. Its totient is φ = 1211201222136.

The previous prime is 1211201222039. The next prime is 1211201222167. The reversal of 1211201222137 is 7312221021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211135466256 + 65755881 = 1100516^2 + 8109^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211201222137 - 2¹⁹ = 1211200697849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211201222167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600611068 + 605600611069.

It is an arithmetic number, because the mean of its divisors is an integer number (605600611069).

Almost surely, 2^{1211201222137} is an apocalyptic number.

It is an amenable number.

1211201222137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211201222137 is an equidigital number, since it uses as much as digits as its factorization.

1211201222137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 1211201222137 its reverse (7312221021121), we get a palindrome (8523422243258).

The spelling of 1211201222137 in words is "one trillion, two hundred eleven billion, two hundred one million, two hundred twenty-two thousand, one hundred thirty-seven".