21001122002112 has 56 divisors (see below), whose sum is σ = 63503392724736. Its totient is φ = 6000320571648.

The previous prime is 21001122002093. The next prime is 21001122002129. The reversal of 21001122002112 is 21120022110012.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 21001122002091 and 21001122002100.

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, 7812916068 + ... + 7812918755.

Almost surely, 2^{21001122002112} is an apocalyptic number.

It is an amenable number.

21001122002112 is an abundant number, since it is smaller than the sum of its proper divisors (42502270722624).

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

21001122002112 is a wasteful number, since it uses less digits than its factorization.

21001122002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15625834845 (or 15625834835 counting only the distinct ones).

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

Adding to 21001122002112 its reverse (21120022110012), we get a palindrome (42121144112124).

The spelling of 21001122002112 in words is "twenty-one trillion, one billion, one hundred twenty-two million, two thousand, one hundred twelve".