21000213023113 has 4 divisors (see below), whose sum is σ = 21567786348100. Its totient is φ = 20432639698128.

The previous prime is 21000213023099. The next prime is 21000213023137. The reversal of 21000213023113 is 31132031200012.

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 18924561956169 + 2075651066944 = 4350237^2 + 1440712^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000213023113 - 2⁴¹ = 18801189767561 is a prime.

It is a super-2 number, since 2×21000213023113² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000213023213) 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, 283786662438 + ... + 283786662511.

It is an arithmetic number, because the mean of its divisors is an integer number (5391946587025).

Almost surely, 2^{21000213023113} is an apocalyptic number.

It is an amenable number.

21000213023113 is a deficient number, since it is larger than the sum of its proper divisors (567573324987).

21000213023113 is an equidigital number, since it uses as much as digits as its factorization.

21000213023113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567573324986.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21000213023113 its reverse (31132031200012), we get a palindrome (52132244223125).

The spelling of 21000213023113 in words is "twenty-one trillion, two hundred thirteen million, twenty-three thousand, one hundred thirteen".