221400004 has 12 divisors (see below), whose sum is σ = 442800064. Its totient is φ = 94885704.

The previous prime is 221399957. The next prime is 221400017. The reversal of 221400004 is 400004122.

221400004 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3953544 + ... + 3953599.

Almost surely, 2^221400004 is an apocalyptic number.

It is an amenable number.

221400004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221400004 is a wasteful number, since it uses less digits than its factorization.

221400004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907154 (or 7907152 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 221400004 is about 14879.5162555777. The cubic root of 221400004 is about 604.9589062087.

Adding to 221400004 its reverse (400004122), we get a palindrome (621404126).

The spelling of 221400004 in words is "two hundred twenty-one million, four hundred thousand, four".