21020303133121 has 4 divisors (see below), whose sum is σ = 21020330615472. Its totient is φ = 21020275650772.

The previous prime is 21020303133113. The next prime is 21020303133199. The reversal of 21020303133121 is 12133130302012.

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 a cyclic number.

It is not a de Polignac number, because 21020303133121 - 2³ = 21020303133113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020303133092 and 21020303133101.

It is not an unprimeable number, because it can be changed into a prime (21020303134121) 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, 12560035 + ... + 14134888.

It is an arithmetic number, because the mean of its divisors is an integer number (5255082653868).

Almost surely, 2^{21020303133121} is an apocalyptic number.

It is an amenable number.

21020303133121 is a deficient number, since it is larger than the sum of its proper divisors (27482351).

21020303133121 is an equidigital number, since it uses as much as digits as its factorization.

21020303133121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27482350.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21020303133121 its reverse (12133130302012), we get a palindrome (33153433435133).

The spelling of 21020303133121 in words is "twenty-one trillion, twenty billion, three hundred three million, one hundred thirty-three thousand, one hundred twenty-one".