421858823 has 2 divisors, whose sum is σ = 421858824. Its totient is φ = 421858822.

The previous prime is 421858807. The next prime is 421858861. The reversal of 421858823 is 328858124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421858823 - 2⁴ = 421858807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421858873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210929411 + 210929412.

It is an arithmetic number, because the mean of its divisors is an integer number (210929412).

Almost surely, 2^421858823 is an apocalyptic number.

421858823 is a deficient number, since it is larger than the sum of its proper divisors (1).

421858823 is an equidigital number, since it uses as much as digits as its factorization.

421858823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122880, while the sum is 41.

The square root of 421858823 is about 20539.2021023213. The cubic root of 421858823 is about 749.9904135071.

The spelling of 421858823 in words is "four hundred twenty-one million, eight hundred fifty-eight thousand, eight hundred twenty-three".