421239679747 has 4 divisors (see below), whose sum is σ = 446018484456. Its totient is φ = 396460875040.

The previous prime is 421239679739. The next prime is 421239679753. The reversal of 421239679747 is 747976932124.

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 421239679747 - 2³ = 421239679739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421239679717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12389402329 + ... + 12389402362.

It is an arithmetic number, because the mean of its divisors is an integer number (111504621114).

Almost surely, 2^421239679747 is an apocalyptic number.

421239679747 is a deficient number, since it is larger than the sum of its proper divisors (24778804709).

421239679747 is a wasteful number, since it uses less digits than its factorization.

421239679747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24778804708.

The product of its digits is 32006016, while the sum is 61.

The spelling of 421239679747 in words is "four hundred twenty-one billion, two hundred thirty-nine million, six hundred seventy-nine thousand, seven hundred forty-seven".