21001300130023 has 2 divisors, whose sum is σ = 21001300130024. Its totient is φ = 21001300130022.

The previous prime is 21001300129961. The next prime is 21001300130033. The reversal of 21001300130023 is 32003100310012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001300130023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001300129979 and 21001300130006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001300130033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500650065011 + 10500650065012.

It is an arithmetic number, because the mean of its divisors is an integer number (10500650065012).

Almost surely, 2^{21001300130023} is an apocalyptic number.

21001300130023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001300130023 is an equidigital number, since it uses as much as digits as its factorization.

21001300130023 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 21001300130023 its reverse (32003100310012), we get a palindrome (53004400440035).

The spelling of 21001300130023 in words is "twenty-one trillion, one billion, three hundred million, one hundred thirty thousand, twenty-three".