21201222222210 has 16 divisors (see below), whose sum is σ = 50882933333376. Its totient is φ = 5653659259248.

The previous prime is 21201222222139. The next prime is 21201222222223. The reversal of 21201222222210 is 1222222210212.

It is a super-2 number, since 2×21201222222210² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 353353703674 + ... + 353353703733.

It is an arithmetic number, because the mean of its divisors is an integer number (3180183333336).

Almost surely, 2^{21201222222210} is an apocalyptic number.

21201222222210 is an abundant number, since it is smaller than the sum of its proper divisors (29681711111166).

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

21201222222210 is a wasteful number, since it uses less digits than its factorization.

21201222222210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706707407417.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21201222222210 its reverse (1222222210212), we get a palindrome (22423444432422).

The spelling of 21201222222210 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred ten".