21001201221012 has 48 divisors (see below), whose sum is σ = 49992571366080. Its totient is φ = 6859763059968.

The previous prime is 21001201220999. The next prime is 21001201221041. The reversal of 21001201221012 is 21012210210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001201220982 and 21001201221000.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 47162923 + ... + 47606130.

It is an arithmetic number, because the mean of its divisors is an integer number (1041511903460).

Almost surely, 2^{21001201221012} is an apocalyptic number.

It is an amenable number.

21001201221012 is an abundant number, since it is smaller than the sum of its proper divisors (28991370145068).

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

21001201221012 is a wasteful number, since it uses less digits than its factorization.

21001201221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94769432 (or 94769430 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21001201221012 its reverse (21012210210012), we get a palindrome (42013411431024).

The spelling of 21001201221012 in words is "twenty-one trillion, one billion, two hundred one million, two hundred twenty-one thousand, twelve".