421705109 has 8 divisors (see below), whose sum is σ = 482266560. Its totient is φ = 361223136.

The previous prime is 421705091. The next prime is 421705117. The reversal of 421705109 is 901507124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421705109 - 2⁸ = 421704853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421705129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8024 + ... + 30129.

It is an arithmetic number, because the mean of its divisors is an integer number (60283320).

Almost surely, 2^421705109 is an apocalyptic number.

It is an amenable number.

421705109 is a deficient number, since it is larger than the sum of its proper divisors (60561451).

421705109 is a wasteful number, since it uses less digits than its factorization.

421705109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39739.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 421705109 is about 20535.4597951933. The cubic root of 421705109 is about 749.8993103346.

The spelling of 421705109 in words is "four hundred twenty-one million, seven hundred five thousand, one hundred nine".