221880042 has 12 divisors (see below), whose sum is σ = 480740130. Its totient is φ = 73960008.

The previous prime is 221880023. The next prime is 221880053. The reversal of 221880042 is 240088122.

It can be written as a sum of positive squares in only one way, i.e., 211440681 + 10439361 = 14541^2 + 3231^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221879988 and 221880015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6163317 + ... + 6163352.

Almost surely, 2^221880042 is an apocalyptic number.

221880042 is an abundant number, since it is smaller than the sum of its proper divisors (258860088).

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

221880042 is a wasteful number, since it uses less digits than its factorization.

221880042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12326677 (or 12326674 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 221880042 is about 14895.6383549011. The cubic root of 221880042 is about 605.3958132053.

The spelling of 221880042 in words is "two hundred twenty-one million, eight hundred eighty thousand, forty-two".