21144592858 has 16 divisors (see below), whose sum is σ = 31811848704. Its totient is φ = 10540670400.

The previous prime is 21144592853. The next prime is 21144592867. The reversal of 21144592858 is 85829544112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21144592853) 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 7 ways as a sum of consecutive naturals, for example, 1973191 + ... + 1983877.

It is an arithmetic number, because the mean of its divisors is an integer number (1988240544).

Almost surely, 2^21144592858 is an apocalyptic number.

21144592858 is a deficient number, since it is larger than the sum of its proper divisors (10667255846).

21144592858 is a wasteful number, since it uses less digits than its factorization.

21144592858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557.

The product of its digits is 921600, while the sum is 49.

The spelling of 21144592858 in words is "twenty-one billion, one hundred forty-four million, five hundred ninety-two thousand, eight hundred fifty-eight".