221642044 has 24 divisors (see below), whose sum is σ = 420911568. Its totient is φ = 101512320.

The previous prime is 221642009. The next prime is 221642059. The reversal of 221642044 is 440246122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9457 + ... + 23080.

It is an arithmetic number, because the mean of its divisors is an integer number (17537982).

Almost surely, 2^221642044 is an apocalyptic number.

It is an amenable number.

221642044 is a deficient number, since it is larger than the sum of its proper divisors (199269524).

221642044 is a wasteful number, since it uses less digits than its factorization.

221642044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32685 (or 32683 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 221642044 is about 14887.6473628307. The cubic root of 221642044 is about 605.1792779720.

Adding to 221642044 its reverse (440246122), we get a palindrome (661888166).

The spelling of 221642044 in words is "two hundred twenty-one million, six hundred forty-two thousand, forty-four".