21020011231013 has 8 divisors (see below), whose sum is σ = 21588221939232. Its totient is φ = 20451805906896.

The previous prime is 21020011230997. The next prime is 21020011231057. The reversal of 21020011231013 is 31013211002012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020011231013 - 2⁴ = 21020011230997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020011230982 and 21020011231000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011231073) 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 7 ways as a sum of consecutive naturals, for example, 7310006 + ... + 9771192.

It is an arithmetic number, because the mean of its divisors is an integer number (2698527742404).

Almost surely, 2^{21020011231013} is an apocalyptic number.

It is an amenable number.

21020011231013 is a deficient number, since it is larger than the sum of its proper divisors (568210708219).

21020011231013 is a wasteful number, since it uses less digits than its factorization.

21020011231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692051.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21020011231013 its reverse (31013211002012), we get a palindrome (52033222233025).

The spelling of 21020011231013 in words is "twenty-one trillion, twenty billion, eleven million, two hundred thirty-one thousand, thirteen".