12121221137 has 2 divisors, whose sum is σ = 12121221138. Its totient is φ = 12121221136.

The previous prime is 12121221121. The next prime is 12121221157. The reversal of 12121221137 is 73112212121.

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., 11177564176 + 943656961 = 105724^2 + 30719^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121221137 - 2⁴ = 12121221121 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121221157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060610568 + 6060610569.

It is an arithmetic number, because the mean of its divisors is an integer number (6060610569).

Almost surely, 2^12121221137 is an apocalyptic number.

It is an amenable number.

12121221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121221137 is an equidigital number, since it uses as much as digits as its factorization.

12121221137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 23.

Adding to 12121221137 its reverse (73112212121), we get a palindrome (85233433258).

The spelling of 12121221137 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred thirty-seven".