21100543013 has 6 divisors (see below), whose sum is σ = 23193158982. Its totient is φ = 19182311720.

The previous prime is 21100543003. The next prime is 21100543027. The reversal of 21100543013 is 31034500112.

It can be written as a sum of positive squares in only one way, i.e., 16287374884 + 4813168129 = 127622^2 + 69377^2 .

It is not a de Polignac number, because 21100543013 - 2¹⁶ = 21100477477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100543003) 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 5 ways as a sum of consecutive naturals, for example, 87192206 + ... + 87192447.

It is an arithmetic number, because the mean of its divisors is an integer number (3865526497).

Almost surely, 2^21100543013 is an apocalyptic number.

It is an amenable number.

21100543013 is a deficient number, since it is larger than the sum of its proper divisors (2092615969).

21100543013 is a wasteful number, since it uses less digits than its factorization.

21100543013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174384675 (or 174384664 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The spelling of 21100543013 in words is "twenty-one billion, one hundred million, five hundred forty-three thousand, thirteen".