21113202013 has 4 divisors (see below), whose sum is σ = 21113513568. Its totient is φ = 21112890460.

The previous prime is 21113202007. The next prime is 21113202017. The reversal of 21113202013 is 31020231112.

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 21113202013 - 2⁵ = 21113201981 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 (21113202017) 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, 6343 + ... + 205588.

It is an arithmetic number, because the mean of its divisors is an integer number (5278378392).

Almost surely, 2^21113202013 is an apocalyptic number.

It is an amenable number.

21113202013 is a deficient number, since it is larger than the sum of its proper divisors (311555).

21113202013 is an equidigital number, since it uses as much as digits as its factorization.

21113202013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311554.

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

Adding to 21113202013 its reverse (31020231112), we get a palindrome (52133433125).

The spelling of 21113202013 in words is "twenty-one billion, one hundred thirteen million, two hundred two thousand, thirteen".