421334521 has 2 divisors, whose sum is σ = 421334522.
Its totient is φ = 421334520.
The previous prime is 421334497. The next prime is 421334531. The reversal of 421334521 is 125433124.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 235284921 + 186049600 = 15339^2 + 13640^2
It is a cyclic number.
It is not a de Polignac number, because 421334521 - 25 = 421334489 is a prime.
It is not a weakly prime, because it can be changed into another prime (421334531) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210667260 + 210667261.
It is an arithmetic number, because the mean of its divisors is an integer number (210667261).
Almost surely, 2421334521 is an apocalyptic number.
It is an amenable number.
421334521 is a deficient number, since it is larger than the sum of its proper divisors (1).
421334521 is an equidigital number, since it uses as much as digits as its factorization.
421334521 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2880, while the sum is 25.
The square root of 421334521 is about 20526.4346879822.
The cubic root of 421334521 is about 749.6795792751.
Adding to 421334521 its reverse (125433124), we get a palindrome (546767645).
The spelling of 421334521 in words is "four hundred twenty-one million, three hundred thirty-four thousand, five hundred twenty-one".