421421783 has 2 divisors, whose sum is σ = 421421784. Its totient is φ = 421421782.

The previous prime is 421421779. The next prime is 421421807. The reversal of 421421783 is 387124124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421421783 - 2² = 421421779 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421421723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710891 + 210710892.

It is an arithmetic number, because the mean of its divisors is an integer number (210710892).

Almost surely, 2^421421783 is an apocalyptic number.

421421783 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421783 is an equidigital number, since it uses as much as digits as its factorization.

421421783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 32.

The square root of 421421783 is about 20528.5601784441. The cubic root of 421421783 is about 749.7313307302.

The spelling of 421421783 in words is "four hundred twenty-one million, four hundred twenty-one thousand, seven hundred eighty-three".