21534030059 has 4 divisors (see below), whose sum is σ = 21743098416. Its totient is φ = 21324961704.

The previous prime is 21534030053. The next prime is 21534030097. The reversal of 21534030059 is 95003043512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21534030059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534030053) 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 3 ways as a sum of consecutive naturals, for example, 104534024 + ... + 104534229.

It is an arithmetic number, because the mean of its divisors is an integer number (5435774604).

Almost surely, 2^21534030059 is an apocalyptic number.

21534030059 is a deficient number, since it is larger than the sum of its proper divisors (209068357).

21534030059 is a wasteful number, since it uses less digits than its factorization.

21534030059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209068356.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 21534030059 in words is "twenty-one billion, five hundred thirty-four million, thirty thousand, fifty-nine".