221722804 has 6 divisors (see below), whose sum is σ = 388014914. Its totient is φ = 110861400.

The previous prime is 221722751. The next prime is 221722811. The reversal of 221722804 is 408227122.

It can be written as a sum of positive squares in only one way, i.e., 148791204 + 72931600 = 12198^2 + 8540^2 .

It is a super-2 number, since 2×221722804² = 98322003627244832, which contains 22 as substring.

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, 27715347 + ... + 27715354.

Almost surely, 2^221722804 is an apocalyptic number.

It is an amenable number.

221722804 is a deficient number, since it is larger than the sum of its proper divisors (166292110).

221722804 is a wasteful number, since it uses less digits than its factorization.

221722804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55430705 (or 55430703 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 221722804 is about 14890.3594315248. The cubic root of 221722804 is about 605.2527723666.

Adding to 221722804 its reverse (408227122), we get a palindrome (629949926).

It can be divided in two parts, 22172 and 2804, that added together give a triangular number (24976 = T₂₂₃).

The spelling of 221722804 in words is "two hundred twenty-one million, seven hundred twenty-two thousand, eight hundred four".