21202220204 has 12 divisors (see below), whose sum is σ = 40476965928. Its totient is φ = 9637372800.

The previous prime is 21202220201. The next prime is 21202220219. The reversal of 21202220204 is 40202220212.

It is not an unprimeable number, because it can be changed into a prime (21202220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240934277 + ... + 240934364.

It is an arithmetic number, because the mean of its divisors is an integer number (3373080494).

Almost surely, 2^21202220204 is an apocalyptic number.

It is an amenable number.

21202220204 is a deficient number, since it is larger than the sum of its proper divisors (19274745724).

21202220204 is a wasteful number, since it uses less digits than its factorization.

21202220204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481868656 (or 481868654 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 21202220204 its reverse (40202220212), we get a palindrome (61404440416).

The spelling of 21202220204 in words is "twenty-one billion, two hundred two million, two hundred twenty thousand, two hundred four".