421540351 has 2 divisors, whose sum is σ = 421540352. Its totient is φ = 421540350.

The previous prime is 421540337. The next prime is 421540363. The reversal of 421540351 is 153045124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421540351 - 2⁵ = 421540319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421540451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210770175 + 210770176.

It is an arithmetic number, because the mean of its divisors is an integer number (210770176).

Almost surely, 2^421540351 is an apocalyptic number.

421540351 is a deficient number, since it is larger than the sum of its proper divisors (1).

421540351 is an equidigital number, since it uses as much as digits as its factorization.

421540351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 421540351 is about 20531.4478544500. The cubic root of 421540351 is about 749.8016370223.

Adding to 421540351 its reverse (153045124), we get a palindrome (574585475).

The spelling of 421540351 in words is "four hundred twenty-one million, five hundred forty thousand, three hundred fifty-one".