421861903 has 2 divisors, whose sum is σ = 421861904. Its totient is φ = 421861902.

The previous prime is 421861897. The next prime is 421861933. The reversal of 421861903 is 309168124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421861903 - 2⁵ = 421861871 is a prime.

It is equal to p_22438375 and since 421861903 and 22438375 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421861933) 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, 210930951 + 210930952.

It is an arithmetic number, because the mean of its divisors is an integer number (210930952).

Almost surely, 2^421861903 is an apocalyptic number.

421861903 is a deficient number, since it is larger than the sum of its proper divisors (1).

421861903 is an equidigital number, since it uses as much as digits as its factorization.

421861903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 421861903 is about 20539.2770807543. The cubic root of 421861903 is about 749.9922387345.

The spelling of 421861903 in words is "four hundred twenty-one million, eight hundred sixty-one thousand, nine hundred three".