21202221221222 has 16 divisors (see below), whose sum is σ = 32089354688160. Its totient is φ = 10505796427392.

The previous prime is 21202221221221. The next prime is 21202221221257. The reversal of 21202221221222 is 22212212220212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202221221221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5103722 + ... + 8273597.

It is an arithmetic number, because the mean of its divisors is an integer number (2005584668010).

Almost surely, 2^{21202221221222} is an apocalyptic number.

21202221221222 is a deficient number, since it is larger than the sum of its proper divisors (10887133466938).

21202221221222 is a wasteful number, since it uses less digits than its factorization.

21202221221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13384447.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21202221221222 its reverse (22212212220212), we get a palindrome (43414433441434).

The spelling of 21202221221222 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".