221939872 has 48 divisors (see below), whose sum is σ = 544767552. Its totient is φ = 86469120.

The previous prime is 221939869. The next prime is 221939873. The reversal of 221939872 is 278939122.

It is not an unprimeable number, because it can be changed into a prime (221939873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42573 + ... + 47500.

It is an arithmetic number, because the mean of its divisors is an integer number (11349324).

Almost surely, 2^221939872 is an apocalyptic number.

221939872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221939872 is an abundant number, since it is smaller than the sum of its proper divisors (322827680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221939872 is a wasteful number, since it uses less digits than its factorization.

221939872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90101 (or 90093 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 221939872 is about 14897.6465255422. The cubic root of 221939872 is about 605.4502233511.

The spelling of 221939872 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, eight hundred seventy-two".