21103732388 has 12 divisors (see below), whose sum is σ = 37376490480. Its totient is φ = 10424735112.

The previous prime is 21103732373. The next prime is 21103732393. The reversal of 21103732388 is 88323730112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31782398 + ... + 31783061.

It is an arithmetic number, because the mean of its divisors is an integer number (3114707540).

Almost surely, 2^21103732388 is an apocalyptic number.

It is an amenable number.

21103732388 is a deficient number, since it is larger than the sum of its proper divisors (16272758092).

21103732388 is a wasteful number, since it uses less digits than its factorization.

21103732388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63565546 (or 63565544 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 21103732388 in words is "twenty-one billion, one hundred three million, seven hundred thirty-two thousand, three hundred eighty-eight".