21301300123 has 2 divisors, whose sum is σ = 21301300124. Its totient is φ = 21301300122.

The previous prime is 21301300099. The next prime is 21301300129. The reversal of 21301300123 is 32100310312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21301300123 - 2¹³ = 21301291931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301300097 and 21301300106.

It is not a weakly prime, because it can be changed into another prime (21301300129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650650061 + 10650650062.

It is an arithmetic number, because the mean of its divisors is an integer number (10650650062).

Almost surely, 2^21301300123 is an apocalyptic number.

21301300123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301300123 is an equidigital number, since it uses as much as digits as its factorization.

21301300123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21301300123 its reverse (32100310312), we get a palindrome (53401610435).

The spelling of 21301300123 in words is "twenty-one billion, three hundred one million, three hundred thousand, one hundred twenty-three".