21000121230313 has 4 divisors (see below), whose sum is σ = 21046892102100. Its totient is φ = 20953350358528.

The previous prime is 21000121230293. The next prime is 21000121230367. The reversal of 21000121230313 is 31303212100012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13218074534889 + 7782046695424 = 3635667^2 + 2789632^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000121230313 - 2²⁵ = 21000087675881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000121230373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23385435220 + ... + 23385436117.

It is an arithmetic number, because the mean of its divisors is an integer number (5261723025525).

Almost surely, 2^{21000121230313} is an apocalyptic number.

It is an amenable number.

21000121230313 is a deficient number, since it is larger than the sum of its proper divisors (46770871787).

21000121230313 is an equidigital number, since it uses as much as digits as its factorization.

21000121230313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46770871786.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21000121230313 its reverse (31303212100012), we get a palindrome (52303333330325).

The spelling of 21000121230313 in words is "twenty-one trillion, one hundred twenty-one million, two hundred thirty thousand, three hundred thirteen".