221668681929 has 8 divisors (see below), whose sum is σ = 295598775840. Its totient is φ = 147758854656.

The previous prime is 221668681921. The next prime is 221668681973. The reversal of 221668681929 is 929186866122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221668681929 - 2³ = 221668681921 is a prime.

It is a super-2 number, since 2×221668681929² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221668681921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5041119 + ... + 5084900.

It is an arithmetic number, because the mean of its divisors is an integer number (36949846980).

Almost surely, 2^221668681929 is an apocalyptic number.

It is an amenable number.

221668681929 is a deficient number, since it is larger than the sum of its proper divisors (73930093911).

221668681929 is a wasteful number, since it uses less digits than its factorization.

221668681929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10133319.

The product of its digits is 8957952, while the sum is 60.

The spelling of 221668681929 in words is "two hundred twenty-one billion, six hundred sixty-eight million, six hundred eighty-one thousand, nine hundred twenty-nine".