21222211202212 has 12 divisors (see below), whose sum is σ = 39323508992460. Its totient is φ = 9986922918656.

The previous prime is 21222211202201. The next prime is 21222211202287. The reversal of 21222211202212 is 21220211222212.

It can be written as a sum of positive squares in 2 ways, for example, as 5819364976896 + 15402846225316 = 2412336^2 + 3924646^2 .

It is a super-2 number, since 2×21222211202212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156045670537 + ... + 156045670672.

It is an arithmetic number, because the mean of its divisors is an integer number (3276959082705).

Almost surely, 2^{21222211202212} is an apocalyptic number.

It is an amenable number.

21222211202212 is a deficient number, since it is larger than the sum of its proper divisors (18101297790248).

21222211202212 is a wasteful number, since it uses less digits than its factorization.

21222211202212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312091341230 (or 312091341228 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21222211202212 its reverse (21220211222212), we get a palindrome (42442422424424).

The spelling of 21222211202212 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, two hundred two thousand, two hundred twelve".