221228004 has 24 divisors (see below), whose sum is σ = 546563808. Its totient is φ = 69404800.

The previous prime is 221228003. The next prime is 221228009. The reversal of 221228004 is 400822122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221228003) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 542022 + ... + 542429.

It is an arithmetic number, because the mean of its divisors is an integer number (22773492).

Almost surely, 2^221228004 is an apocalyptic number.

It is an amenable number.

221228004 is an abundant number, since it is smaller than the sum of its proper divisors (325335804).

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

221228004 is a wasteful number, since it uses less digits than its factorization.

221228004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084475 (or 1084473 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 221228004 is about 14873.7353748142. The cubic root of 221228004 is about 604.8022065896.

The spelling of 221228004 in words is "two hundred twenty-one million, two hundred twenty-eight thousand, four".