21220101212912 has 20 divisors (see below), whose sum is σ = 46987366971696. Its totient is φ = 9094329091200.

The previous prime is 21220101212911. The next prime is 21220101212939. The reversal of 21220101212912 is 21921210102212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220101212911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94732594589 + ... + 94732594812.

Almost surely, 2^{21220101212912} is an apocalyptic number.

It is an amenable number.

21220101212912 is an abundant number, since it is smaller than the sum of its proper divisors (25767265758784).

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

21220101212912 is a wasteful number, since it uses less digits than its factorization.

21220101212912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189465189416 (or 189465189410 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 21220101212912 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, nine hundred twelve".