21011031222204 has 12 divisors (see below), whose sum is σ = 49025739518504. Its totient is φ = 7003677074064.

The previous prime is 21011031222193. The next prime is 21011031222217. The reversal of 21011031222204 is 40222213011012.

It is a happy number.

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

It is a congruent number.

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, 875459634247 + ... + 875459634270.

Almost surely, 2^{21011031222204} is an apocalyptic number.

It is an amenable number.

21011031222204 is an abundant number, since it is smaller than the sum of its proper divisors (28014708296300).

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

21011031222204 is a wasteful number, since it uses less digits than its factorization.

21011031222204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750919268524 (or 1750919268522 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21011031222204 its reverse (40222213011012), we get a palindrome (61233244233216).

The spelling of 21011031222204 in words is "twenty-one trillion, eleven billion, thirty-one million, two hundred twenty-two thousand, two hundred four".