221458728673 has 16 divisors (see below), whose sum is σ = 272577356800. Its totient is φ = 175211885376.

The previous prime is 221458728661. The next prime is 221458728719. The reversal of 221458728673 is 376827854122.

It is a cyclic number.

It is not a de Polignac number, because 221458728673 - 2³³ = 212868794081 is a prime.

It is a super-2 number, since 2×221458728673² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221458728643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2545903 + ... + 2631451.

It is an arithmetic number, because the mean of its divisors is an integer number (17036084800).

Almost surely, 2^221458728673 is an apocalyptic number.

It is an amenable number.

221458728673 is a deficient number, since it is larger than the sum of its proper divisors (51118628127).

221458728673 is a wasteful number, since it uses less digits than its factorization.

221458728673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114016.

The product of its digits is 9031680, while the sum is 55.

It can be divided in two parts, 221458 and 728673, that added together give a triangular number (950131 = T₁₃₇₈).

The spelling of 221458728673 in words is "two hundred twenty-one billion, four hundred fifty-eight million, seven hundred twenty-eight thousand, six hundred seventy-three".