6781226421 has 4 divisors (see below), whose sum is σ = 9041635232. Its totient is φ = 4520817612.

The previous prime is 6781226363. The next prime is 6781226437. The reversal of 6781226421 is 1246221876.

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 not a de Polignac number, because 6781226421 - 2⁶ = 6781226357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6781226421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781227421) 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, 1130204401 + ... + 1130204406.

It is an arithmetic number, because the mean of its divisors is an integer number (2260408808).

Almost surely, 2^6781226421 is an apocalyptic number.

It is an amenable number.

6781226421 is a deficient number, since it is larger than the sum of its proper divisors (2260408811).

6781226421 is a wasteful number, since it uses less digits than its factorization.

6781226421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260408810.

The product of its digits is 64512, while the sum is 39.

The square root of 6781226421 is about 82348.2022936749. The cubic root of 6781226421 is about 1892.7913757422.

The spelling of 6781226421 in words is "six billion, seven hundred eighty-one million, two hundred twenty-six thousand, four hundred twenty-one".