221020220104 has 16 divisors (see below), whose sum is σ = 420089803020. Its totient is φ = 108996272640.

The previous prime is 221020220093. The next prime is 221020220153. The reversal of 221020220104 is 401022020122.

It can be written as a sum of positive squares in 2 ways, for example, as 211050197604 + 9970022500 = 459402^2 + 99850^2 .

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, 189229057 + ... + 189230224.

Almost surely, 2^221020220104 is an apocalyptic number.

It is an amenable number.

221020220104 is a deficient number, since it is larger than the sum of its proper divisors (199069582916).

221020220104 is a wasteful number, since it uses less digits than its factorization.

221020220104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378459360 (or 378459356 counting only the distinct ones).

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

Adding to 221020220104 its reverse (401022020122), we get a palindrome (622042240226).

The spelling of 221020220104 in words is "two hundred twenty-one billion, twenty million, two hundred twenty thousand, one hundred four".