221401204 has 6 divisors (see below), whose sum is σ = 387452114. Its totient is φ = 110700600.

The previous prime is 221401199. The next prime is 221401261. The reversal of 221401204 is 402104122.

It can be written as a sum of positive squares in only one way, i.e., 171557604 + 49843600 = 13098^2 + 7060^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27675147 + ... + 27675154.

Almost surely, 2^221401204 is an apocalyptic number.

It is an amenable number.

221401204 is a deficient number, since it is larger than the sum of its proper divisors (166050910).

221401204 is a wasteful number, since it uses less digits than its factorization.

221401204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55350305 (or 55350303 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221401204 is about 14879.5565794146. The cubic root of 221401204 is about 604.9599991767.

Adding to 221401204 its reverse (402104122), we get a palindrome (623505326).

The spelling of 221401204 in words is "two hundred twenty-one million, four hundred one thousand, two hundred four".