21021012220012 has 36 divisors (see below), whose sum is σ = 44653330315440. Its totient is φ = 8617309355424.

The previous prime is 21021012219967. The next prime is 21021012220027. The reversal of 21021012220012 is 21002221012012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2331518587 + ... + 2331527602.

It is an arithmetic number, because the mean of its divisors is an integer number (1240370286540).

Almost surely, 2^{21021012220012} is an apocalyptic number.

It is an amenable number.

21021012220012 is an abundant number, since it is smaller than the sum of its proper divisors (23632318095428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021012220012 is a wasteful number, since it uses less digits than its factorization.

21021012220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663046230 (or 4663046221 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021012220012 its reverse (21002221012012), we get a palindrome (42023233232024).

The spelling of 21021012220012 in words is "twenty-one trillion, twenty-one billion, twelve million, two hundred twenty thousand, twelve".