21001022010112 has 72 divisors (see below), whose sum is σ = 42719872955760. Its totient is φ = 10300236410880.

The previous prime is 21001022010083. The next prime is 21001022010121. The reversal of 21001022010112 is 21101022010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001022010092 and 21001022010101.

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, 65794839 + ... + 66113257.

It is an arithmetic number, because the mean of its divisors is an integer number (593331568830).

Almost surely, 2^{21001022010112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21001022010112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21359936477880).

21001022010112 is an abundant number, since it is smaller than the sum of its proper divisors (21718850945648).

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

21001022010112 is an equidigital number, since it uses as much as digits as its factorization.

21001022010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323349 (or 323335 counting only the distinct ones).

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

Adding to 21001022010112 its reverse (21101022010012), we get a palindrome (42102044020124).

The spelling of 21001022010112 in words is "twenty-one trillion, one billion, twenty-two million, ten thousand, one hundred twelve".