21221112220012 has 24 divisors (see below), whose sum is σ = 38768364940032. Its totient is φ = 10144835778000.

The previous prime is 21221112220001. The next prime is 21221112220013. The reversal of 21221112220012 is 21002221112212.

It is not an unprimeable number, because it can be changed into a prime (21221112220013) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 49693114 + ... + 50118337.

It is an arithmetic number, because the mean of its divisors is an integer number (1615348539168).

Almost surely, 2^{21221112220012} is an apocalyptic number.

It is an amenable number.

21221112220012 is a deficient number, since it is larger than the sum of its proper divisors (17547252720020).

21221112220012 is a wasteful number, since it uses less digits than its factorization.

21221112220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99813789 (or 99813787 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221112220012 its reverse (21002221112212), we get a palindrome (42223333332224).

The spelling of 21221112220012 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, twelve".