21020013030013 has 4 divisors (see below), whose sum is σ = 21060358544988. Its totient is φ = 20979667515040.

The previous prime is 21020013030007. The next prime is 21020013030059. The reversal of 21020013030013 is 31003031002012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10254513939289 + 10765499090724 = 3202267^2 + 3281082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020013030013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020013030113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20172756706 + ... + 20172757747.

It is an arithmetic number, because the mean of its divisors is an integer number (5265089636247).

Almost surely, 2^{21020013030013} is an apocalyptic number.

It is an amenable number.

21020013030013 is a deficient number, since it is larger than the sum of its proper divisors (40345514975).

21020013030013 is an equidigital number, since it uses as much as digits as its factorization.

21020013030013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40345514974.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21020013030013 its reverse (31003031002012), we get a palindrome (52023044032025).

The spelling of 21020013030013 in words is "twenty-one trillion, twenty billion, thirteen million, thirty thousand, thirteen".