21020011110020 has 48 divisors (see below), whose sum is σ = 47539862480880. Its totient is φ = 7760859542016.

The previous prime is 21020011110013. The next prime is 21020011110101. The reversal of 21020011110020 is 2001111002012.

It can be written as a sum of positive squares in 8 ways, for example, as 219825948736 + 20800185161284 = 468856^2 + 4560722^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21020011109983 and 21020011110010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3460694 + ... + 7349586.

It is an arithmetic number, because the mean of its divisors is an integer number (990413801685).

Almost surely, 2^{21020011110020} is an apocalyptic number.

21020011110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020011110020 is an abundant number, since it is smaller than the sum of its proper divisors (26519851370860).

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

21020011110020 is a wasteful number, since it uses less digits than its factorization.

21020011110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909704 (or 3909702 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21020011110020 its reverse (2001111002012), we get a palindrome (23021122112032).

The spelling of 21020011110020 in words is "twenty-one trillion, twenty billion, eleven million, one hundred ten thousand, twenty".