21140813508 has 24 divisors (see below), whose sum is σ = 49332315648. Its totient is φ = 7046402016.

The previous prime is 21140813483. The next prime is 21140813513. The reversal of 21140813508 is 80531804112.

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 7 ways as a sum of consecutive naturals, for example, 117810 + ... + 236982.

It is an arithmetic number, because the mean of its divisors is an integer number (2055513152).

Almost surely, 2^21140813508 is an apocalyptic number.

It is an amenable number.

21140813508 is an abundant number, since it is smaller than the sum of its proper divisors (28191502140).

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

21140813508 is a wasteful number, since it uses less digits than its factorization.

21140813508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133963 (or 133961 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 21140813508 in words is "twenty-one billion, one hundred forty million, eight hundred thirteen thousand, five hundred eight".