21143843658 has 96 divisors (see below), whose sum is σ = 54915853824. Its totient is φ = 5752705536.

The previous prime is 21143843657. The next prime is 21143843681. The reversal of 21143843658 is 85634834112.

21143843658 is a `hidden beast` number, since 21 + 143 + 8 + 436 + 58 = 666.

It is not an unprimeable number, because it can be changed into a prime (21143843657) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 170866 + ... + 267362.

It is an arithmetic number, because the mean of its divisors is an integer number (572040144).

Almost surely, 2^21143843658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143843658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27457926912).

21143843658 is an abundant number, since it is smaller than the sum of its proper divisors (33772010166).

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

21143843658 is a wasteful number, since it uses less digits than its factorization.

21143843658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96596 (or 96593 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The spelling of 21143843658 in words is "twenty-one billion, one hundred forty-three million, eight hundred forty-three thousand, six hundred fifty-eight".