21010011210020 has 72 divisors (see below), whose sum is σ = 52027530872184. Its totient is φ = 7104755234304.

The previous prime is 21010011209989. The next prime is 21010011210059. The reversal of 21010011210020 is 2001211001012.

It can be written as a sum of positive squares in 4 ways, for example, as 6331503997504 + 14678507212516 = 2516248^2 + 3831254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21010011209983 and 21010011210010.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 146769467 + ... + 146912546.

It is an arithmetic number, because the mean of its divisors is an integer number (722604595447).

Almost surely, 2^{21010011210020} is an apocalyptic number.

21010011210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010011210020 is an abundant number, since it is smaller than the sum of its proper divisors (31017519662164).

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

21010011210020 is a wasteful number, since it uses less digits than its factorization.

21010011210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293682109 (or 293682100 counting only the distinct ones).

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

Adding to 21010011210020 its reverse (2001211001012), we get a palindrome (23011222211032).

The spelling of 21010011210020 in words is "twenty-one trillion, ten billion, eleven million, two hundred ten thousand, twenty".