21200131313121 has 4 divisors (see below), whose sum is σ = 28266841750832. Its totient is φ = 14133420875412.

The previous prime is 21200131313099. The next prime is 21200131313147. The reversal of 21200131313121 is 12131313100212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21200131313121 - 2⁹ = 21200131312609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200031313121) 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, 3533355218851 + ... + 3533355218856.

It is an arithmetic number, because the mean of its divisors is an integer number (7066710437708).

Almost surely, 2^{21200131313121} is an apocalyptic number.

It is an amenable number.

21200131313121 is a deficient number, since it is larger than the sum of its proper divisors (7066710437711).

21200131313121 is an equidigital number, since it uses as much as digits as its factorization.

21200131313121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066710437710.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21200131313121 its reverse (12131313100212), we get a palindrome (33331444413333).

The spelling of 21200131313121 in words is "twenty-one trillion, two hundred billion, one hundred thirty-one million, three hundred thirteen thousand, one hundred twenty-one".