421644103 has 2 divisors, whose sum is σ = 421644104. Its totient is φ = 421644102.

The previous prime is 421644071. The next prime is 421644109. The reversal of 421644103 is 301446124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421644103 - 2⁵ = 421644071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421644109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210822051 + 210822052.

It is an arithmetic number, because the mean of its divisors is an integer number (210822052).

Almost surely, 2^421644103 is an apocalyptic number.

421644103 is a deficient number, since it is larger than the sum of its proper divisors (1).

421644103 is an equidigital number, since it uses as much as digits as its factorization.

421644103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 421644103 is about 20533.9743595827. The cubic root of 421644103 is about 749.8631471781.

The spelling of 421644103 in words is "four hundred twenty-one million, six hundred forty-four thousand, one hundred three".