21915011870 has 32 divisors (see below), whose sum is σ = 40204618272. Its totient is φ = 8597759872.

The previous prime is 21915011779. The next prime is 21915011887. The reversal of 21915011870 is 7811051912.

It is a self number, because there is not a number n which added to its sum of digits gives 21915011870.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2376689 + ... + 2385891.

It is an arithmetic number, because the mean of its divisors is an integer number (1256394321).

Almost surely, 2^21915011870 is an apocalyptic number.

21915011870 is a deficient number, since it is larger than the sum of its proper divisors (18289606402).

21915011870 is a wasteful number, since it uses less digits than its factorization.

21915011870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13756.

The product of its (nonzero) digits is 5040, while the sum is 35.

The spelling of 21915011870 in words is "twenty-one billion, nine hundred fifteen million, eleven thousand, eight hundred seventy".