21212112201222 has 16 divisors (see below), whose sum is σ = 42658612384752. Its totient is φ = 7031639403360.

The previous prime is 21212112201211. The next prime is 21212112201271. The reversal of 21212112201222 is 22210221121212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9766164753 + ... + 9766166924.

It is an arithmetic number, because the mean of its divisors is an integer number (2666163274047).

Almost surely, 2^{21212112201222} is an apocalyptic number.

21212112201222 is an abundant number, since it is smaller than the sum of its proper divisors (21446500183530).

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

21212112201222 is a wasteful number, since it uses less digits than its factorization.

21212112201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19532331863.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21212112201222 its reverse (22210221121212), we get a palindrome (43422333322434).

The spelling of 21212112201222 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, two hundred one thousand, two hundred twenty-two".