21221111012212 has 12 divisors (see below), whose sum is σ = 37174418490496. Its totient is φ = 10599848586360.

The previous prime is 21221111012197. The next prime is 21221111012237. The reversal of 21221111012212 is 21221011112212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221111012212.

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 3 ways as a sum of consecutive naturals, for example, 2676725478 + ... + 2676733405.

Almost surely, 2^{21221111012212} is an apocalyptic number.

It is an amenable number.

21221111012212 is a deficient number, since it is larger than the sum of its proper divisors (15953307478284).

21221111012212 is a wasteful number, since it uses less digits than its factorization.

21221111012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353459878 (or 5353459876 counting only the distinct ones).

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

Adding to 21221111012212 its reverse (21221011112212), we get a palindrome (42442122124424).

The spelling of 21221111012212 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twelve thousand, two hundred twelve".