221904472 has 16 divisors (see below), whose sum is σ = 416932560. Its totient is φ = 110722464.

The previous prime is 221904461. The next prime is 221904509. The reversal of 221904472 is 274409122.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 24583 + ... + 32374.

It is an arithmetic number, because the mean of its divisors is an integer number (26058285).

Almost surely, 2^221904472 is an apocalyptic number.

It is an amenable number.

221904472 is a deficient number, since it is larger than the sum of its proper divisors (195028088).

221904472 is a wasteful number, since it uses less digits than its factorization.

221904472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57450 (or 57446 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 221904472 is about 14896.4583710357. The cubic root of 221904472 is about 605.4180313324.

It can be divided in two parts, 22190 and 4472, that added together give a palindrome (26662).

The spelling of 221904472 in words is "two hundred twenty-one million, nine hundred four thousand, four hundred seventy-two".