1221104657 has 2 divisors, whose sum is σ = 1221104658. Its totient is φ = 1221104656.

The previous prime is 1221104639. The next prime is 1221104671. The reversal of 1221104657 is 7564011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1057290256 + 163814401 = 32516^2 + 12799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221104657 - 2¹⁰ = 1221103633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221104057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610552328 + 610552329.

It is an arithmetic number, because the mean of its divisors is an integer number (610552329).

Almost surely, 2^1221104657 is an apocalyptic number.

It is an amenable number.

1221104657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221104657 is an equidigital number, since it uses as much as digits as its factorization.

1221104657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1221104657 is about 34944.3079341972. The cubic root of 1221104657 is about 1068.8521352775.

Adding to 1221104657 its reverse (7564011221), we get a palindrome (8785115878).

The spelling of 1221104657 in words is "one billion, two hundred twenty-one million, one hundred four thousand, six hundred fifty-seven".