21113011523603 has 4 divisors (see below), whose sum is σ = 21113098793208. Its totient is φ = 21112924254000.

The previous prime is 21113011523521. The next prime is 21113011523609. The reversal of 21113011523603 is 30632511031112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113011523603 - 2²⁶ = 21112944414739 is a prime.

It is a super-2 number, since 2×21113011523603² (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 (21113011523609) 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, 43270898 + ... + 43756103.

It is an arithmetic number, because the mean of its divisors is an integer number (5278274698302).

Almost surely, 2^{21113011523603} is an apocalyptic number.

21113011523603 is a deficient number, since it is larger than the sum of its proper divisors (87269605).

21113011523603 is an equidigital number, since it uses as much as digits as its factorization.

21113011523603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87269604.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 21113011523603 its reverse (30632511031112), we get a palindrome (51745522554715).

The spelling of 21113011523603 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, five hundred twenty-three thousand, six hundred three".