421858861 has 2 divisors, whose sum is σ = 421858862. Its totient is φ = 421858860.

The previous prime is 421858823. The next prime is 421858873. The reversal of 421858861 is 168858124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295633636 + 126225225 = 17194^2 + 11235^2 .

It is a cyclic number.

It is not a de Polignac number, because 421858861 - 2¹³ = 421850669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421858891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210929430 + 210929431.

It is an arithmetic number, because the mean of its divisors is an integer number (210929431).

Almost surely, 2^421858861 is an apocalyptic number.

It is an amenable number.

421858861 is a deficient number, since it is larger than the sum of its proper divisors (1).

421858861 is an equidigital number, since it uses as much as digits as its factorization.

421858861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122880, while the sum is 43.

The square root of 421858861 is about 20539.2030273816. The cubic root of 421858861 is about 749.9904360262.

The spelling of 421858861 in words is "four hundred twenty-one million, eight hundred fifty-eight thousand, eight hundred sixty-one".