21020011130320 has 80 divisors (see below), whose sum is σ = 54469812191040. Its totient is φ = 7496920369152.

The previous prime is 21020011130311. The next prime is 21020011130329. The reversal of 21020011130320 is 2303111002012.

It is an interprime number because it is at equal distance from previous prime (21020011130311) and next prime (21020011130329).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21020011130294 and 21020011130303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011130329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406708122 + ... + 406759801.

It is an arithmetic number, because the mean of its divisors is an integer number (680872652388).

Almost surely, 2^{21020011130320} is an apocalyptic number.

21020011130320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020011130320 is an abundant number, since it is smaller than the sum of its proper divisors (33449801060720).

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

21020011130320 is a wasteful number, since it uses less digits than its factorization.

21020011130320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813467972 (or 813467966 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21020011130320 its reverse (2303111002012), we get a palindrome (23323122132332).

The spelling of 21020011130320 in words is "twenty-one trillion, twenty billion, eleven million, one hundred thirty thousand, three hundred twenty".