1224240866521 has 2 divisors, whose sum is σ = 1224240866522. Its totient is φ = 1224240866520.

The previous prime is 1224240866507. The next prime is 1224240866533. The reversal of 1224240866521 is 1256680424221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658676704921 + 565564161600 = 811589^2 + 752040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224240866521 - 2²³ = 1224232477913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1224240866501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612120433260 + 612120433261.

It is an arithmetic number, because the mean of its divisors is an integer number (612120433261).

Almost surely, 2^{1224240866521} is an apocalyptic number.

It is an amenable number.

1224240866521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224240866521 is an equidigital number, since it uses as much as digits as its factorization.

1224240866521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 368640, while the sum is 43.

The spelling of 1224240866521 in words is "one trillion, two hundred twenty-four billion, two hundred forty million, eight hundred sixty-six thousand, five hundred twenty-one".