1421343643 has 2 divisors, whose sum is σ = 1421343644. Its totient is φ = 1421343642.

The previous prime is 1421343523. The next prime is 1421343661. The reversal of 1421343643 is 3463431241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421343643 - 2²⁵ = 1387789211 is a prime.

It is a super-2 number, since 2×1421343643² = 4040435502993022898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1421343683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710671821 + 710671822.

It is an arithmetic number, because the mean of its divisors is an integer number (710671822).

Almost surely, 2^1421343643 is an apocalyptic number.

1421343643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421343643 is an equidigital number, since it uses as much as digits as its factorization.

1421343643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 1421343643 is about 37700.7114389105. The cubic root of 1421343643 is about 1124.3452698638.

Adding to 1421343643 its reverse (3463431241), we get a palindrome (4884774884).

The spelling of 1421343643 in words is "one billion, four hundred twenty-one million, three hundred forty-three thousand, six hundred forty-three".