21011102221222 has 4 divisors (see below), whose sum is σ = 31516653331836. Its totient is φ = 10505551110610.

The previous prime is 21011102221181. The next prime is 21011102221231. The reversal of 21011102221222 is 22212220111012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21011102221222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252775555304 + ... + 5252775555307.

It is an arithmetic number, because the mean of its divisors is an integer number (7879163332959).

Almost surely, 2^{21011102221222} is an apocalyptic number.

21011102221222 is a deficient number, since it is larger than the sum of its proper divisors (10505551110614).

21011102221222 is a wasteful number, since it uses less digits than its factorization.

21011102221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505551110613.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21011102221222 its reverse (22212220111012), we get a palindrome (43223322332234).

The spelling of 21011102221222 in words is "twenty-one trillion, eleven billion, one hundred two million, two hundred twenty-one thousand, two hundred twenty-two".