421216487 has 2 divisors, whose sum is σ = 421216488. Its totient is φ = 421216486.

The previous prime is 421216459. The next prime is 421216489. The reversal of 421216487 is 784612124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421216487 - 2⁶ = 421216423 is a prime.

Together with 421216489, 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 (421216489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210608243 + 210608244.

It is an arithmetic number, because the mean of its divisors is an integer number (210608244).

Almost surely, 2^421216487 is an apocalyptic number.

421216487 is a deficient number, since it is larger than the sum of its proper divisors (1).

421216487 is an equidigital number, since it uses as much as digits as its factorization.

421216487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 421216487 is about 20523.5593160641. The cubic root of 421216487 is about 749.6095668586.

The spelling of 421216487 in words is "four hundred twenty-one million, two hundred sixteen thousand, four hundred eighty-seven".