21121101211222 has 12 divisors (see below), whose sum is σ = 33119004641940. Its totient is φ = 10101396230948.

The previous prime is 21121101211211. The next prime is 21121101211237. The reversal of 21121101211222 is 22211210112112.

It is a happy number.

It is a super-2 number, since 2×21121101211222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121101211222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9981615772 + ... + 9981617887.

It is an arithmetic number, because the mean of its divisors is an integer number (2759917053495).

Almost surely, 2^{21121101211222} is an apocalyptic number.

21121101211222 is a deficient number, since it is larger than the sum of its proper divisors (11997903430718).

21121101211222 is a wasteful number, since it uses less digits than its factorization.

21121101211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19963233707 (or 19963233684 counting only the distinct ones).

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

Adding to 21121101211222 its reverse (22211210112112), we get a palindrome (43332311323334).

The spelling of 21121101211222 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, two hundred eleven thousand, two hundred twenty-two".