21858187104 has 144 divisors (see below), whose sum is σ = 70878592512. Its totient is φ = 6329954304.

The previous prime is 21858187093. The next prime is 21858187159. The reversal of 21858187104 is 40178185812.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 21858187104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108064 + ... + 235359.

It is an arithmetic number, because the mean of its divisors is an integer number (492212448).

Almost surely, 2^21858187104 is an apocalyptic number.

21858187104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21858187104 is an abundant number, since it is smaller than the sum of its proper divisors (49020405408).

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

21858187104 is a wasteful number, since it uses less digits than its factorization.

21858187104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343469 (or 343458 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The spelling of 21858187104 in words is "twenty-one billion, eight hundred fifty-eight million, one hundred eighty-seven thousand, one hundred four".