21893568849 has 24 divisors (see below), whose sum is σ = 32528358720. Its totient is φ = 14179542048.

The previous prime is 21893568839. The next prime is 21893568887. The reversal of 21893568849 is 94886539812.

21893568849 is a `hidden beast` number, since 21 + 8 + 9 + 3 + 568 + 8 + 49 = 666.

It is not a de Polignac number, because 21893568849 - 2¹² = 21893564753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21893568839) 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 23 ways as a sum of consecutive naturals, for example, 169564 + ... + 269330.

It is an arithmetic number, because the mean of its divisors is an integer number (1355348280).

Almost surely, 2^21893568849 is an apocalyptic number.

It is an amenable number.

21893568849 is a deficient number, since it is larger than the sum of its proper divisors (10634789871).

21893568849 is a wasteful number, since it uses less digits than its factorization.

21893568849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100469 (or 100466 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 21893568849 in words is "twenty-one billion, eight hundred ninety-three million, five hundred sixty-eight thousand, eight hundred forty-nine".