421330541 has 2 divisors, whose sum is σ = 421330542. Its totient is φ = 421330540.

The previous prime is 421330519. The next prime is 421330571. The reversal of 421330541 is 145033124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254274916 + 167055625 = 15946^2 + 12925^2 .

It is a cyclic number.

It is not a de Polignac number, because 421330541 - 2²⁶ = 354221677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421330571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210665270 + 210665271.

It is an arithmetic number, because the mean of its divisors is an integer number (210665271).

Almost surely, 2^421330541 is an apocalyptic number.

It is an amenable number.

421330541 is a deficient number, since it is larger than the sum of its proper divisors (1).

421330541 is an equidigital number, since it uses as much as digits as its factorization.

421330541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 421330541 is about 20526.3377395969. The cubic root of 421330541 is about 749.6772187326.

Adding to 421330541 its reverse (145033124), we get a palindrome (566363665).

The spelling of 421330541 in words is "four hundred twenty-one million, three hundred thirty thousand, five hundred forty-one".