21112323010020 has 192 divisors, whose sum is σ = 71676010425600. Its totient is φ = 5116562795520.

The previous prime is 21112323010013. The next prime is 21112323010069. The reversal of 21112323010020 is 2001032321112.

21112323010020 is a `hidden beast` number, since 2 + 111 + 232 + 301 + 0 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21112323009975 and 21112323010002.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18800946 + ... + 19892214.

It is an arithmetic number, because the mean of its divisors is an integer number (373312554300).

Almost surely, 2^{21112323010020} is an apocalyptic number.

21112323010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112323010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35838005212800).

21112323010020 is an abundant number, since it is smaller than the sum of its proper divisors (50563687415580).

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

21112323010020 is a wasteful number, since it uses less digits than its factorization.

21112323010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094555 (or 1094547 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112323010020 its reverse (2001032321112), we get a palindrome (23113355331132).

The spelling of 21112323010020 in words is "twenty-one trillion, one hundred twelve billion, three hundred twenty-three million, ten thousand, twenty".