421320541 has 2 divisors, whose sum is σ = 421320542. Its totient is φ = 421320540.

The previous prime is 421320539. The next prime is 421320553. The reversal of 421320541 is 145023124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389904516 + 31416025 = 19746^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 421320541 - 2¹ = 421320539 is a prime.

Together with 421320539, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421320511) 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, 210660270 + 210660271.

It is an arithmetic number, because the mean of its divisors is an integer number (210660271).

Almost surely, 2^421320541 is an apocalyptic number.

It is an amenable number.

421320541 is a deficient number, since it is larger than the sum of its proper divisors (1).

421320541 is an equidigital number, since it uses as much as digits as its factorization.

421320541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 421320541 is about 20526.0941486684. The cubic root of 421320541 is about 749.6712876557.

Adding to 421320541 its reverse (145023124), we get a palindrome (566343665).

The spelling of 421320541 in words is "four hundred twenty-one million, three hundred twenty thousand, five hundred forty-one".