21858443542 has 64 divisors (see below), whose sum is σ = 37520437248. Its totient is φ = 9480240000.

The previous prime is 21858443527. The next prime is 21858443587. The reversal of 21858443542 is 24534485812.

It is a junction number, because it is equal to n+sod(n) for n = 21858443492 and 21858443501.

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 31 ways as a sum of consecutive naturals, for example, 3831292 + ... + 3836992.

It is an arithmetic number, because the mean of its divisors is an integer number (586256832).

Almost surely, 2^21858443542 is an apocalyptic number.

21858443542 is a deficient number, since it is larger than the sum of its proper divisors (15661993706).

21858443542 is a wasteful number, since it uses less digits than its factorization.

21858443542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5885.

The product of its digits is 1228800, while the sum is 46.

The spelling of 21858443542 in words is "twenty-one billion, eight hundred fifty-eight million, four hundred forty-three thousand, five hundred forty-two".