21113003523 has 16 divisors (see below), whose sum is σ = 28211801472. Its totient is φ = 14044800000.

The previous prime is 21113003501. The next prime is 21113003531. The reversal of 21113003523 is 32530031112.

It is not a de Polignac number, because 21113003523 - 2⁶ = 21113003459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113003523.

It is not an unprimeable number, because it can be changed into a prime (21113003533) 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 15 ways as a sum of consecutive naturals, for example, 5480548 + ... + 5484398.

It is an arithmetic number, because the mean of its divisors is an integer number (1763237592).

Almost surely, 2^21113003523 is an apocalyptic number.

21113003523 is a deficient number, since it is larger than the sum of its proper divisors (7098797949).

21113003523 is a wasteful number, since it uses less digits than its factorization.

21113003523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21113003523 its reverse (32530031112), we get a palindrome (53643034635).

The spelling of 21113003523 in words is "twenty-one billion, one hundred thirteen million, three thousand, five hundred twenty-three".