421821571647 has 24 divisors (see below), whose sum is σ = 657908956800. Its totient is φ = 239694285936.

The previous prime is 421821571637. The next prime is 421821571649. The reversal of 421821571647 is 746175128124.

It is not a de Polignac number, because 421821571647 - 2¹¹ = 421821569599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421821571596 and 421821571605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421821571649) 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 23 ways as a sum of consecutive naturals, for example, 7989147 + ... + 8041772.

It is an arithmetic number, because the mean of its divisors is an integer number (27412873200).

Almost surely, 2^421821571647 is an apocalyptic number.

421821571647 is a deficient number, since it is larger than the sum of its proper divisors (236087385153).

421821571647 is a wasteful number, since it uses less digits than its factorization.

421821571647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16031115 (or 16031108 counting only the distinct ones).

The product of its digits is 752640, while the sum is 48.

The spelling of 421821571647 in words is "four hundred twenty-one billion, eight hundred twenty-one million, five hundred seventy-one thousand, six hundred forty-seven".