21201222220010 has 24 divisors (see below), whose sum is σ = 44392763261700. Its totient is φ = 7268990475264.

The previous prime is 21201222219941. The next prime is 21201222220141. The reversal of 21201222220010 is 1002222210212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21165419146921 + 35803073089 = 4600589^2 + 189217^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21633899735 + ... + 21633900714.

Almost surely, 2^{21201222220010} is an apocalyptic number.

21201222220010 is an abundant number, since it is smaller than the sum of its proper divisors (23191541041690).

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

21201222220010 is a wasteful number, since it uses less digits than its factorization.

21201222220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43267800470 (or 43267800463 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201222220010 its reverse (1002222210212), we get a palindrome (22203444430222).

The spelling of 21201222220010 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty thousand, ten".