21020011002013 has 4 divisors (see below), whose sum is σ = 22126327370560. Its totient is φ = 19913694633468.

The previous prime is 21020011001921. The next prime is 21020011002059. The reversal of 21020011002013 is 31020011002012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21020011002013 - 2²⁹ = 21019474131101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020011001984 and 21020011002002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011002073) 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 3 ways as a sum of consecutive naturals, for example, 553158184245 + ... + 553158184282.

It is an arithmetic number, because the mean of its divisors is an integer number (5531581842640).

Almost surely, 2^{21020011002013} is an apocalyptic number.

It is an amenable number.

21020011002013 is a deficient number, since it is larger than the sum of its proper divisors (1106316368547).

21020011002013 is a wasteful number, since it uses less digits than its factorization.

21020011002013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106316368546.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21020011002013 its reverse (31020011002012), we get a palindrome (52040022004025).

Subtracting 21020011002013 from its reverse (31020011002012), we obtain a palindrome (9999999999999).

The spelling of 21020011002013 in words is "twenty-one trillion, twenty billion, eleven million, two thousand, thirteen".