21534317199 has 12 divisors (see below), whose sum is σ = 31119058776. Its totient is φ = 14349780432.

The previous prime is 21534317113. The next prime is 21534317213. The reversal of 21534317199 is 99171343512.

21534317199 is a `hidden beast` number, since 21 + 5 + 3 + 431 + 7 + 199 = 666.

It is not a de Polignac number, because 21534317199 - 2⁸ = 21534316943 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534317099) 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 11 ways as a sum of consecutive naturals, for example, 514669 + ... + 554934.

It is an arithmetic number, because the mean of its divisors is an integer number (2593254898).

Almost surely, 2^21534317199 is an apocalyptic number.

21534317199 is a deficient number, since it is larger than the sum of its proper divisors (9584741577).

21534317199 is a wasteful number, since it uses less digits than its factorization.

21534317199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071846 (or 1071843 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The spelling of 21534317199 in words is "twenty-one billion, five hundred thirty-four million, three hundred seventeen thousand, one hundred ninety-nine".