21001300130123 has 4 divisors (see below), whose sum is σ = 21076037853288. Its totient is φ = 20926562406960.

The previous prime is 21001300130099. The next prime is 21001300130159. The reversal of 21001300130123 is 32103100310012.

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 21001300130123 - 2⁸ = 21001300129867 is a prime.

It is a super-3 number, since 3×21001300130123³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001300130023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37368861161 + ... + 37368861722.

It is an arithmetic number, because the mean of its divisors is an integer number (5269009463322).

Almost surely, 2^{21001300130123} is an apocalyptic number.

21001300130123 is a deficient number, since it is larger than the sum of its proper divisors (74737723165).

21001300130123 is an equidigital number, since it uses as much as digits as its factorization.

21001300130123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74737723164.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21001300130123 its reverse (32103100310012), we get a palindrome (53104400440135).

The spelling of 21001300130123 in words is "twenty-one trillion, one billion, three hundred million, one hundred thirty thousand, one hundred twenty-three".