21488111188 has 24 divisors (see below), whose sum is σ = 38819265408. Its totient is φ = 10401315456.

The previous prime is 21488111171. The next prime is 21488111201. The reversal of 21488111188 is 88111188412.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 533356 + ... + 572227.

It is an arithmetic number, because the mean of its divisors is an integer number (1617469392).

Almost surely, 2^21488111188 is an apocalyptic number.

It is an amenable number.

21488111188 is a deficient number, since it is larger than the sum of its proper divisors (17331154220).

21488111188 is a wasteful number, since it uses less digits than its factorization.

21488111188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105743 (or 1105741 counting only the distinct ones).

The product of its digits is 32768, while the sum is 43.

The spelling of 21488111188 in words is "twenty-one billion, four hundred eighty-eight million, one hundred eleven thousand, one hundred eighty-eight".