21111102221012 has 48 divisors (see below), whose sum is σ = 38163182400000. Its totient is φ = 10207820388480.

The previous prime is 21111102220997. The next prime is 21111102221017. The reversal of 21111102221012 is 21012220111112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111102221017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1923907958 + ... + 1923918930.

It is an arithmetic number, because the mean of its divisors is an integer number (795066300000).

Almost surely, 2^{21111102221012} is an apocalyptic number.

It is an amenable number.

21111102221012 is a deficient number, since it is larger than the sum of its proper divisors (17052080178988).

21111102221012 is a wasteful number, since it uses less digits than its factorization.

21111102221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20576 (or 20574 counting only the distinct ones).

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

Adding to 21111102221012 its reverse (21012220111112), we get a palindrome (42123322332124).

The spelling of 21111102221012 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, two hundred twenty-one thousand, twelve".