221313804 has 12 divisors (see below), whose sum is σ = 516398904. Its totient is φ = 73771264.

The previous prime is 221313793. The next prime is 221313817. The reversal of 221313804 is 408313122.

221313804 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9221397 + ... + 9221420.

It is an arithmetic number, because the mean of its divisors is an integer number (43033242).

Almost surely, 2^221313804 is an apocalyptic number.

It is an amenable number.

221313804 is an abundant number, since it is smaller than the sum of its proper divisors (295085100).

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

221313804 is a wasteful number, since it uses less digits than its factorization.

221313804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18442824 (or 18442822 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 221313804 is about 14876.6193740379. The cubic root of 221313804 is about 604.8803843388.

Adding to 221313804 its reverse (408313122), we get a palindrome (629626926).

The spelling of 221313804 in words is "two hundred twenty-one million, three hundred thirteen thousand, eight hundred four".