21103327123 has 2 divisors, whose sum is σ = 21103327124. Its totient is φ = 21103327122.

The previous prime is 21103327093. The next prime is 21103327127. The reversal of 21103327123 is 32172330112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21103327123 - 2¹³ = 21103318931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103327127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551663561 + 10551663562.

It is an arithmetic number, because the mean of its divisors is an integer number (10551663562).

Almost surely, 2^21103327123 is an apocalyptic number.

21103327123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103327123 is an equidigital number, since it uses as much as digits as its factorization.

21103327123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21103327123 its reverse (32172330112), we get a palindrome (53275657235).

It can be divided in two parts, 2110 and 3327123, that added together give a palindrome (3329233).

The spelling of 21103327123 in words is "twenty-one billion, one hundred three million, three hundred twenty-seven thousand, one hundred twenty-three".