421544109 has 24 divisors (see below), whose sum is σ = 654619008. Its totient is φ = 240589440.

The previous prime is 421544077. The next prime is 421544141. The reversal of 421544109 is 901445124.

It is an interprime number because it is at equal distance from previous prime (421544077) and next prime (421544141).

It is not a de Polignac number, because 421544109 - 2⁵ = 421544077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421544309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193989 + ... + 196149.

It is an arithmetic number, because the mean of its divisors is an integer number (27275792).

Almost surely, 2^421544109 is an apocalyptic number.

421544109 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

421544109 is a deficient number, since it is larger than the sum of its proper divisors (233074899).

421544109 is a wasteful number, since it uses less digits than its factorization.

421544109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505 (or 3498 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 421544109 is about 20531.5393723900. The cubic root of 421544109 is about 749.8038651571.

The spelling of 421544109 in words is "four hundred twenty-one million, five hundred forty-four thousand, one hundred nine".