21001220220012 has 12 divisors (see below), whose sum is σ = 49002847180056. Its totient is φ = 7000406740000.

The previous prime is 21001220220011. The next prime is 21001220220059. The reversal of 21001220220012 is 21002202210012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21001220220012³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001220219973 and 21001220220000.

It is not an unprimeable number, because it can be changed into a prime (21001220220011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875050842489 + ... + 875050842512.

It is an arithmetic number, because the mean of its divisors is an integer number (4083570598338).

Almost surely, 2^{21001220220012} is an apocalyptic number.

It is an amenable number.

21001220220012 is an abundant number, since it is smaller than the sum of its proper divisors (28001626960044).

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

21001220220012 is a wasteful number, since it uses less digits than its factorization.

21001220220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750101685008 (or 1750101685006 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21001220220012 its reverse (21002202210012), we get a palindrome (42003422430024).

The spelling of 21001220220012 in words is "twenty-one trillion, one billion, two hundred twenty million, two hundred twenty thousand, twelve".