1220221109137 has 2 divisors, whose sum is σ = 1220221109138. Its totient is φ = 1220221109136.

The previous prime is 1220221109131. The next prime is 1220221109161. The reversal of 1220221109137 is 7319011220221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 905616786321 + 314604322816 = 951639^2 + 560896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220221109137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220221109099 and 1220221109108.

It is not a weakly prime, because it can be changed into another prime (1220221109131) 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, 610110554568 + 610110554569.

It is an arithmetic number, because the mean of its divisors is an integer number (610110554569).

Almost surely, 2^{1220221109137} is an apocalyptic number.

It is an amenable number.

1220221109137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221109137 is an equidigital number, since it uses as much as digits as its factorization.

1220221109137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

Adding to 1220221109137 its reverse (7319011220221), we get a palindrome (8539232329358).

The spelling of 1220221109137 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one hundred nine thousand, one hundred thirty-seven".