21211121101222 has 32 divisors (see below), whose sum is σ = 34583496665760. Its totient is φ = 9698578337280.

The previous prime is 21211121101217. The next prime is 21211121101279. The reversal of 21211121101222 is 22210112111212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211121101222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4604229 + ... + 7976287.

It is an arithmetic number, because the mean of its divisors is an integer number (1080734270805).

Almost surely, 2^{21211121101222} is an apocalyptic number.

21211121101222 is a deficient number, since it is larger than the sum of its proper divisors (13372375564538).

21211121101222 is a wasteful number, since it uses less digits than its factorization.

21211121101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374328.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211121101222 its reverse (22210112111212), we get a palindrome (43421233212434).

The spelling of 21211121101222 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-two".