21299511543 has 16 divisors (see below), whose sum is σ = 28753716096. Its totient is φ = 14022636320.

The previous prime is 21299511533. The next prime is 21299511557. The reversal of 21299511543 is 34511599212.

It is a cyclic number.

It is not a de Polignac number, because 21299511543 - 2¹⁸ = 21299249399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21299511495 and 21299511504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299511523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613321 + ... + 647117.

It is an arithmetic number, because the mean of its divisors is an integer number (1797107256).

Almost surely, 2^21299511543 is an apocalyptic number.

21299511543 is a deficient number, since it is larger than the sum of its proper divisors (7454204553).

21299511543 is a wasteful number, since it uses less digits than its factorization.

21299511543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36414.

The product of its digits is 97200, while the sum is 42.

The spelling of 21299511543 in words is "twenty-one billion, two hundred ninety-nine million, five hundred eleven thousand, five hundred forty-three".