21943299549 has 16 divisors (see below), whose sum is σ = 29624785344. Its totient is φ = 14445513600.

The previous prime is 21943299527. The next prime is 21943299577. The reversal of 21943299549 is 94599234912.

It is not a de Polignac number, because 21943299549 - 2⁵ = 21943299517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21943299509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512529 + ... + 553689.

It is an arithmetic number, because the mean of its divisors is an integer number (1851549084).

Almost surely, 2^21943299549 is an apocalyptic number.

It is an amenable number.

21943299549 is a deficient number, since it is larger than the sum of its proper divisors (7681485795).

21943299549 is a wasteful number, since it uses less digits than its factorization.

21943299549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43388.

The product of its digits is 6298560, while the sum is 57.

The spelling of 21943299549 in words is "twenty-one billion, nine hundred forty-three million, two hundred ninety-nine thousand, five hundred forty-nine".