421327978417 has 4 divisors (see below), whose sum is σ = 421357711716. Its totient is φ = 421298245120.

The previous prime is 421327978301. The next prime is 421327978433. The reversal of 421327978417 is 714879723124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 337931779761 + 83396198656 = 581319^2 + 288784^2 .

It is a cyclic number.

It is not a de Polignac number, because 421327978417 - 2³⁵ = 386968240049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421327978717) 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, 14845384 + ... + 14873737.

It is an arithmetic number, because the mean of its divisors is an integer number (105339427929).

Almost surely, 2^421327978417 is an apocalyptic number.

It is an amenable number.

421327978417 is a deficient number, since it is larger than the sum of its proper divisors (29733299).

421327978417 is a wasteful number, since it uses less digits than its factorization.

421327978417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29733298.

The product of its digits is 4741632, while the sum is 55.

The spelling of 421327978417 in words is "four hundred twenty-one billion, three hundred twenty-seven million, nine hundred seventy-eight thousand, four hundred seventeen".