21120020102112 has 48 divisors (see below), whose sum is σ = 55440298150272. Its totient is φ = 7039975541120.

The previous prime is 21120020102039. The next prime is 21120020102113. The reversal of 21120020102112 is 21120102002112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21120020102112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21120020102091 and 21120020102100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120020102113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33898687 + ... + 34516097.

It is an arithmetic number, because the mean of its divisors is an integer number (1155006211464).

Almost surely, 2^{21120020102112} is an apocalyptic number.

It is an amenable number.

21120020102112 is an abundant number, since it is smaller than the sum of its proper divisors (34320278048160).

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

21120020102112 is a wasteful number, since it uses less digits than its factorization.

21120020102112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973751 (or 973743 counting only the distinct ones).

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

Adding to 21120020102112 its reverse (21120102002112), we get a palindrome (42240122104224).

The spelling of 21120020102112 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one hundred two thousand, one hundred twelve".