21111210504 has 96 divisors (see below), whose sum is σ = 62627175000. Its totient is φ = 6394730496.

The previous prime is 21111210481. The next prime is 21111210539. The reversal of 21111210504 is 40501211112.

It can be written as a sum of positive squares in 4 ways, for example, as 20883140100 + 228070404 = 144510^2 + 15102^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261879 + ... + 332870.

Almost surely, 2^21111210504 is an apocalyptic number.

21111210504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21111210504 is an abundant number, since it is smaller than the sum of its proper divisors (41515964496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111210504 is a wasteful number, since it uses less digits than its factorization.

21111210504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594807 (or 594800 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 21111210504 its reverse (40501211112), we get a palindrome (61612421616).

The spelling of 21111210504 in words is "twenty-one billion, one hundred eleven million, two hundred ten thousand, five hundred four".