21222101111012 has 6 divisors (see below), whose sum is σ = 37138676944278. Its totient is φ = 10611050555504.

The previous prime is 21222101110999. The next prime is 21222101111039. The reversal of 21222101111012 is 21011110122212.

It can be written as a sum of positive squares in only one way, i.e., 20423837487076 + 798263623936 = 4519274^2 + 893456^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652762638873 + ... + 2652762638880.

It is an arithmetic number, because the mean of its divisors is an integer number (6189779490713).

Almost surely, 2^{21222101111012} is an apocalyptic number.

It is an amenable number.

21222101111012 is a deficient number, since it is larger than the sum of its proper divisors (15916575833266).

21222101111012 is a wasteful number, since it uses less digits than its factorization.

21222101111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305525277757 (or 5305525277755 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21222101111012 its reverse (21011110122212), we get a palindrome (42233211233224).

The spelling of 21222101111012 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred one million, one hundred eleven thousand, twelve".