421387511 has 2 divisors, whose sum is σ = 421387512. Its totient is φ = 421387510.

The previous prime is 421387489. The next prime is 421387513. The reversal of 421387511 is 115783124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421387511 - 2²² = 417193207 is a prime.

Together with 421387513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421387513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210693755 + 210693756.

It is an arithmetic number, because the mean of its divisors is an integer number (210693756).

Almost surely, 2^421387511 is an apocalyptic number.

421387511 is a deficient number, since it is larger than the sum of its proper divisors (1).

421387511 is an equidigital number, since it uses as much as digits as its factorization.

421387511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 421387511 is about 20527.7254219750. The cubic root of 421387511 is about 749.7110062874.

The spelling of 421387511 in words is "four hundred twenty-one million, three hundred eighty-seven thousand, five hundred eleven".