221234567679 has 10 divisors (see below), whose sum is σ = 330486206160. Its totient is φ = 147489711732.

The previous prime is 221234567663. The next prime is 221234567693. The reversal of 221234567679 is 976765432122.

221234567679 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 3 + 4 + 567 + 6 + 79 = 666.

It is not a de Polignac number, because 221234567679 - 2⁴ = 221234567663 is a prime.

It is a super-2 number, since 2×221234567679² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221234567779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1365645399 + ... + 1365645560.

It is an arithmetic number, because the mean of its divisors is an integer number (33048620616).

Almost surely, 2^221234567679 is an apocalyptic number.

221234567679 is a deficient number, since it is larger than the sum of its proper divisors (109251638481).

221234567679 is an equidigital number, since it uses as much as digits as its factorization.

221234567679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731290971 (or 2731290962 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 54.

The spelling of 221234567679 in words is "two hundred twenty-one billion, two hundred thirty-four million, five hundred sixty-seven thousand, six hundred seventy-nine".