21010021220112 has 20 divisors (see below), whose sum is σ = 54275888152080. Its totient is φ = 7003340406688.

The previous prime is 21010021220099. The next prime is 21010021220131. The reversal of 21010021220112 is 21102212001012.

It is a junction number, because it is equal to n+sod(n) for n = 21010021220091 and 21010021220100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218854387662 + ... + 218854387757.

It is an arithmetic number, because the mean of its divisors is an integer number (2713794407604).

Almost surely, 2^{21010021220112} is an apocalyptic number.

It is an amenable number.

21010021220112 is an abundant number, since it is smaller than the sum of its proper divisors (33265866931968).

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

21010021220112 is a wasteful number, since it uses less digits than its factorization.

21010021220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437708775430 (or 437708775424 counting only the distinct ones).

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

Adding to 21010021220112 its reverse (21102212001012), we get a palindrome (42112233221124).

The spelling of 21010021220112 in words is "twenty-one trillion, ten billion, twenty-one million, two hundred twenty thousand, one hundred twelve".