21001220001112 has 64 divisors (see below), whose sum is σ = 42504792120000. Its totient is φ = 9670364626944.

The previous prime is 21001220001077. The next prime is 21001220001163. The reversal of 21001220001112 is 21110002210012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21001220001092 and 21001220001101.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 879694008 + ... + 879717880.

It is an arithmetic number, because the mean of its divisors is an integer number (664137376875).

Almost surely, 2^{21001220001112} is an apocalyptic number.

It is an amenable number.

21001220001112 is an abundant number, since it is smaller than the sum of its proper divisors (21503572118888).

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

21001220001112 is a wasteful number, since it uses less digits than its factorization.

21001220001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43180 (or 43176 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001220001112 its reverse (21110002210012), we get a palindrome (42111222211124).

The spelling of 21001220001112 in words is "twenty-one trillion, one billion, two hundred twenty million, one thousand, one hundred twelve".