21500030541 has 32 divisors (see below), whose sum is σ = 31652674560. Its totient is φ = 12872787200.

The previous prime is 21500030477. The next prime is 21500030561. The reversal of 21500030541 is 14503000512.

It is a cyclic number.

It is not a de Polignac number, because 21500030541 - 2⁶ = 21500030477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500030561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150450 + ... + 1168988.

It is an arithmetic number, because the mean of its divisors is an integer number (989146080).

Almost surely, 2^21500030541 is an apocalyptic number.

It is an amenable number.

21500030541 is a deficient number, since it is larger than the sum of its proper divisors (10152644019).

21500030541 is a wasteful number, since it uses less digits than its factorization.

21500030541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18977.

The product of its (nonzero) digits is 600, while the sum is 21.

The spelling of 21500030541 in words is "twenty-one billion, five hundred million, thirty thousand, five hundred forty-one".