21500143103 has 4 divisors (see below), whose sum is σ = 21512016888. Its totient is φ = 21488269320.

The previous prime is 21500143099. The next prime is 21500143109. The reversal of 21500143103 is 30134100512.

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

It is a cyclic number.

It is not a de Polignac number, because 21500143103 - 2² = 21500143099 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 (21500143109) 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, 5934176 + ... + 5937797.

It is an arithmetic number, because the mean of its divisors is an integer number (5378004222).

Almost surely, 2^21500143103 is an apocalyptic number.

21500143103 is a deficient number, since it is larger than the sum of its proper divisors (11873785).

21500143103 is a wasteful number, since it uses less digits than its factorization.

21500143103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11873784.

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

Adding to 21500143103 its reverse (30134100512), we get a palindrome (51634243615).

The spelling of 21500143103 in words is "twenty-one billion, five hundred million, one hundred forty-three thousand, one hundred three".