221614452728 has 16 divisors (see below), whose sum is σ = 415539240000. Its totient is φ = 110803988736.

The previous prime is 221614452727. The next prime is 221614452767. The reversal of 221614452728 is 827254416122.

221614452728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221614452728² (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 (221614452727) 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 3 ways as a sum of consecutive naturals, for example, 100328 + ... + 673271.

It is an arithmetic number, because the mean of its divisors is an integer number (25971202500).

Almost surely, 2^221614452728 is an apocalyptic number.

It is an amenable number.

221614452728 is a deficient number, since it is larger than the sum of its proper divisors (193924787272).

221614452728 is a wasteful number, since it uses less digits than its factorization.

221614452728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809414 (or 809410 counting only the distinct ones).

The product of its digits is 430080, while the sum is 44.

The spelling of 221614452728 in words is "two hundred twenty-one billion, six hundred fourteen million, four hundred fifty-two thousand, seven hundred twenty-eight".