421853211643 has 4 divisors (see below), whose sum is σ = 432142314408. Its totient is φ = 411564108880.

The previous prime is 421853211613. The next prime is 421853211649. The reversal of 421853211643 is 346112358124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421853211643 - 2²¹ = 421851114491 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421853211596 and 421853211605.

It is not an unprimeable number, because it can be changed into a prime (421853211649) 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, 5144551321 + ... + 5144551402.

It is an arithmetic number, because the mean of its divisors is an integer number (108035578602).

Almost surely, 2^421853211643 is an apocalyptic number.

421853211643 is a deficient number, since it is larger than the sum of its proper divisors (10289102765).

421853211643 is a wasteful number, since it uses less digits than its factorization.

421853211643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10289102764.

The product of its digits is 138240, while the sum is 40.

Adding to 421853211643 its reverse (346112358124), we get a palindrome (767965569767).

The spelling of 421853211643 in words is "four hundred twenty-one billion, eight hundred fifty-three million, two hundred eleven thousand, six hundred forty-three".