1221017907937 has 2 divisors, whose sum is σ = 1221017907938. Its totient is φ = 1221017907936.

The previous prime is 1221017907883. The next prime is 1221017907947. The reversal of 1221017907937 is 7397097101221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 884570346256 + 336447561681 = 940516^2 + 580041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221017907937 - 2²³ = 1221009519329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221017907947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610508953968 + 610508953969.

It is an arithmetic number, because the mean of its divisors is an integer number (610508953969).

Almost surely, 2^{1221017907937} is an apocalyptic number.

It is an amenable number.

1221017907937 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221017907937 is an equidigital number, since it uses as much as digits as its factorization.

1221017907937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 333396, while the sum is 49.

The spelling of 1221017907937 in words is "one trillion, two hundred twenty-one billion, seventeen million, nine hundred seven thousand, nine hundred thirty-seven".