1421851217 has 2 divisors, whose sum is σ = 1421851218. Its totient is φ = 1421851216.

The previous prime is 1421851181. The next prime is 1421851229. The reversal of 1421851217 is 7121581241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1274204416 + 147646801 = 35696^2 + 12151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421851217 - 2²² = 1417656913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421851247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710925608 + 710925609.

It is an arithmetic number, because the mean of its divisors is an integer number (710925609).

Almost surely, 2^1421851217 is an apocalyptic number.

It is an amenable number.

1421851217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421851217 is an equidigital number, since it uses as much as digits as its factorization.

1421851217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 32.

The square root of 1421851217 is about 37707.4424616680. The cubic root of 1421851217 is about 1124.4790917137.

The spelling of 1421851217 in words is "one billion, four hundred twenty-one million, eight hundred fifty-one thousand, two hundred seventeen".