21112020010020 has 48 divisors (see below), whose sum is σ = 59367362745600. Its totient is φ = 5605709458176.

The previous prime is 21112020010009. The next prime is 21112020010021. The reversal of 21112020010020 is 2001002021112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21112020009978 and 21112020010005.

It is not an unprimeable number, because it can be changed into a prime (21112020010021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 755065420 + ... + 755093379.

It is an arithmetic number, because the mean of its divisors is an integer number (1236820057200).

Almost surely, 2^{21112020010020} is an apocalyptic number.

21112020010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112020010020 is an abundant number, since it is smaller than the sum of its proper divisors (38255342735580).

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

21112020010020 is a wasteful number, since it uses less digits than its factorization.

21112020010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510159044 (or 1510159042 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21112020010020 its reverse (2001002021112), we get a palindrome (23113022031132).

The spelling of 21112020010020 in words is "twenty-one trillion, one hundred twelve billion, twenty million, ten thousand, twenty".