21545140108 has 12 divisors (see below), whose sum is σ = 38723022352. Its totient is φ = 10481419440.

The previous prime is 21545140103. The next prime is 21545140121. The reversal of 21545140108 is 80104154512.

It is a self number, because there is not a number n which added to its sum of digits gives 21545140108.

It is not an unprimeable number, because it can be changed into a prime (21545140103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72787488 + ... + 72787783.

Almost surely, 2^21545140108 is an apocalyptic number.

It is an amenable number.

21545140108 is a deficient number, since it is larger than the sum of its proper divisors (17177882244).

21545140108 is a wasteful number, since it uses less digits than its factorization.

21545140108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145575312 (or 145575310 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The spelling of 21545140108 in words is "twenty-one billion, five hundred forty-five million, one hundred forty thousand, one hundred eight".