221321343164 has 6 divisors (see below), whose sum is σ = 387312350544. Its totient is φ = 110660671580.

The previous prime is 221321343161. The next prime is 221321343167. The reversal of 221321343164 is 461343123122.

It is an interprime number because it is at equal distance from previous prime (221321343161) and next prime (221321343167).

It is a self number, because there is not a number n which added to its sum of digits gives 221321343164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321343161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27665167892 + ... + 27665167899.

It is an arithmetic number, because the mean of its divisors is an integer number (64552058424).

Almost surely, 2^221321343164 is an apocalyptic number.

It is an amenable number.

221321343164 is a deficient number, since it is larger than the sum of its proper divisors (165991007380).

221321343164 is a wasteful number, since it uses less digits than its factorization.

221321343164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55330335795 (or 55330335793 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

Adding to 221321343164 its reverse (461343123122), we get a palindrome (682664466286).

The spelling of 221321343164 in words is "two hundred twenty-one billion, three hundred twenty-one million, three hundred forty-three thousand, one hundred sixty-four".