21212112101222 has 16 divisors (see below), whose sum is σ = 36363696951840. Its totient is φ = 9090886134528.

The previous prime is 21212112101221. The next prime is 21212112101233. The reversal of 21212112101222 is 22210121121212.

It is a junction number, because it is equal to n+sod(n) for n = 21212112101194 and 21212112101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212112101221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6893654 + ... + 9484022.

It is an arithmetic number, because the mean of its divisors is an integer number (2272731059490).

Almost surely, 2^{21212112101222} is an apocalyptic number.

21212112101222 is a deficient number, since it is larger than the sum of its proper divisors (15151584850618).

21212112101222 is a wasteful number, since it uses less digits than its factorization.

21212112101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175295.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21212112101222 its reverse (22210121121212), we get a palindrome (43422233222434).

The spelling of 21212112101222 in words is "twenty-one trillion, two hundred twelve billion, one hundred twelve million, one hundred one thousand, two hundred twenty-two".