21887355854 has 16 divisors (see below), whose sum is σ = 40407426528. Its totient is φ = 8658734112.

The previous prime is 21887355839. The next prime is 21887355863. The reversal of 21887355854 is 45855378812.

It is a self number, because there is not a number n which added to its sum of digits gives 21887355854.

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 7 ways as a sum of consecutive naturals, for example, 60129917 + ... + 60130280.

It is an arithmetic number, because the mean of its divisors is an integer number (2525464158).

Almost surely, 2^21887355854 is an apocalyptic number.

21887355854 is a deficient number, since it is larger than the sum of its proper divisors (18520070674).

21887355854 is a wasteful number, since it uses less digits than its factorization.

21887355854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120260219.

The product of its digits is 10752000, while the sum is 56.

The spelling of 21887355854 in words is "twenty-one billion, eight hundred eighty-seven million, three hundred fifty-five thousand, eight hundred fifty-four".