421344681 has 4 divisors (see below), whose sum is σ = 561792912. Its totient is φ = 280896452.

The previous prime is 421344667. The next prime is 421344689. The reversal of 421344681 is 186443124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421344681 - 2⁶ = 421344617 is a prime.

It is a super-2 number, since 2×421344681² = 355062680413983522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421344689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70224111 + ... + 70224116.

It is an arithmetic number, because the mean of its divisors is an integer number (140448228).

Almost surely, 2^421344681 is an apocalyptic number.

It is an amenable number.

421344681 is a deficient number, since it is larger than the sum of its proper divisors (140448231).

421344681 is a wasteful number, since it uses less digits than its factorization.

421344681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140448230.

The product of its digits is 18432, while the sum is 33.

The square root of 421344681 is about 20526.6821722362. The cubic root of 421344681 is about 749.6856051151.

The spelling of 421344681 in words is "four hundred twenty-one million, three hundred forty-four thousand, six hundred eighty-one".