421371641 has 2 divisors, whose sum is σ = 421371642. Its totient is φ = 421371640.

The previous prime is 421371619. The next prime is 421371659. The reversal of 421371641 is 146173124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323856016 + 97515625 = 17996^2 + 9875^2 .

It is a cyclic number.

It is not a de Polignac number, because 421371641 - 2¹⁴ = 421355257 is a prime.

It is not a weakly prime, because it can be changed into another prime (421371611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210685820 + 210685821.

It is an arithmetic number, because the mean of its divisors is an integer number (210685821).

Almost surely, 2^421371641 is an apocalyptic number.

It is an amenable number.

421371641 is a deficient number, since it is larger than the sum of its proper divisors (1).

421371641 is an equidigital number, since it uses as much as digits as its factorization.

421371641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 421371641 is about 20527.3388679585. The cubic root of 421371641 is about 749.7015944731.

The spelling of 421371641 in words is "four hundred twenty-one million, three hundred seventy-one thousand, six hundred forty-one".