21544893103 has 4 divisors (see below), whose sum is σ = 21582758160. Its totient is φ = 21507028048.

The previous prime is 21544893047. The next prime is 21544893119. The reversal of 21544893103 is 30139844512.

It is a happy number.

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-21544893103 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 (21544893163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18931675 + ... + 18932812.

It is an arithmetic number, because the mean of its divisors is an integer number (5395689540).

Almost surely, 2^21544893103 is an apocalyptic number.

21544893103 is a deficient number, since it is larger than the sum of its proper divisors (37865057).

21544893103 is an equidigital number, since it uses as much as digits as its factorization.

21544893103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37865056.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 21544893103 in words is "twenty-one billion, five hundred forty-four million, eight hundred ninety-three thousand, one hundred three".