21324444103 has 2 divisors, whose sum is σ = 21324444104. Its totient is φ = 21324444102.

The previous prime is 21324444101. The next prime is 21324444131. The reversal of 21324444103 is 30144442312.

It is an a-pointer prime, because the next prime (21324444131) can be obtained adding 21324444103 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21324444103 - 2¹ = 21324444101 is a prime.

Together with 21324444101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324444101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662222051 + 10662222052.

It is an arithmetic number, because the mean of its divisors is an integer number (10662222052).

Almost surely, 2^21324444103 is an apocalyptic number.

21324444103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324444103 is an equidigital number, since it uses as much as digits as its factorization.

21324444103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21324444103 its reverse (30144442312), we get a palindrome (51468886415).

The spelling of 21324444103 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty-four thousand, one hundred three".