1421718121 has 2 divisors, whose sum is σ = 1421718122. Its totient is φ = 1421718120.

The previous prime is 1421718107. The next prime is 1421718139. The reversal of 1421718121 is 1218171241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198544400 + 223173721 = 34620^2 + 14939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421718121 - 2²⁹ = 884847209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1421718121.

It is not a weakly prime, because it can be changed into another prime (1421718101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710859060 + 710859061.

It is an arithmetic number, because the mean of its divisors is an integer number (710859061).

Almost surely, 2^1421718121 is an apocalyptic number.

It is an amenable number.

1421718121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421718121 is an equidigital number, since it uses as much as digits as its factorization.

1421718121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 28.

The square root of 1421718121 is about 37705.6775698302. The cubic root of 1421718121 is about 1124.4440040436. Note that the first 3 decimals are identical.

Adding to 1421718121 its reverse (1218171241), we get a palindrome (2639889362).

The spelling of 1421718121 in words is "one billion, four hundred twenty-one million, seven hundred eighteen thousand, one hundred twenty-one".