21113033413 has 4 divisors (see below), whose sum is σ = 21511392588. Its totient is φ = 20714674240.

The previous prime is 21113033407. The next prime is 21113033437. The reversal of 21113033413 is 31433031112.

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 8963923684 + 12149109729 = 94678^2 + 110223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113033413 - 2¹⁷ = 21112902341 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 (21113033813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199179508 + ... + 199179613.

It is an arithmetic number, because the mean of its divisors is an integer number (5377848147).

Almost surely, 2^21113033413 is an apocalyptic number.

It is an amenable number.

21113033413 is a deficient number, since it is larger than the sum of its proper divisors (398359175).

21113033413 is an equidigital number, since it uses as much as digits as its factorization.

21113033413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398359174.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21113033413 its reverse (31433031112), we get a palindrome (52546064525).

The spelling of 21113033413 in words is "twenty-one billion, one hundred thirteen million, thirty-three thousand, four hundred thirteen".