21002120110012 has 24 divisors (see below), whose sum is σ = 36897939318240. Its totient is φ = 10459867815360.

The previous prime is 21002120110007. The next prime is 21002120110067. The reversal of 21002120110012 is 21001102120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002120109974 and 21002120110001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3222753 + ... + 7238119.

It is an arithmetic number, because the mean of its divisors is an integer number (1537414138260).

Almost surely, 2^{21002120110012} is an apocalyptic number.

It is an amenable number.

21002120110012 is a deficient number, since it is larger than the sum of its proper divisors (15895819208228).

21002120110012 is a wasteful number, since it uses less digits than its factorization.

21002120110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020501 (or 4020499 counting only the distinct ones).

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

Adding to 21002120110012 its reverse (21001102120012), we get a palindrome (42003222230024).

The spelling of 21002120110012 in words is "twenty-one trillion, two billion, one hundred twenty million, one hundred ten thousand, twelve".