1421420321 has 2 divisors, whose sum is σ = 1421420322. Its totient is φ = 1421420320.

The previous prime is 1421420317. The next prime is 1421420323. The reversal of 1421420321 is 1230241241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1421290000 + 130321 = 37700^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421420321 - 2² = 1421420317 is a prime.

Together with 1421420323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421420293 and 1421420302.

It is not a weakly prime, because it can be changed into another prime (1421420323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710710160 + 710710161.

It is an arithmetic number, because the mean of its divisors is an integer number (710710161).

Almost surely, 2^1421420321 is an apocalyptic number.

It is an amenable number.

1421420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421420321 is an equidigital number, since it uses as much as digits as its factorization.

1421420321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1421420321 is about 37701.7283556073. The cubic root of 1421420321 is about 1124.3654880559.

Adding to 1421420321 its reverse (1230241241), we get a palindrome (2651661562).

The spelling of 1421420321 in words is "one billion, four hundred twenty-one million, four hundred twenty thousand, three hundred twenty-one".