1260217421 has 2 divisors, whose sum is σ = 1260217422. Its totient is φ = 1260217420.

The previous prime is 1260217397. The next prime is 1260217477. The reversal of 1260217421 is 1247120621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 721513321 + 538704100 = 26861^2 + 23210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1260217421 - 2²⁶ = 1193108557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1260217481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630108710 + 630108711.

It is an arithmetic number, because the mean of its divisors is an integer number (630108711).

Almost surely, 2^1260217421 is an apocalyptic number.

It is an amenable number.

1260217421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1260217421 is an equidigital number, since it uses as much as digits as its factorization.

1260217421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1260217421 is about 35499.5411378795. The cubic root of 1260217421 is about 1080.1444197017.

The spelling of 1260217421 in words is "one billion, two hundred sixty million, two hundred seventeen thousand, four hundred twenty-one".