21000023332121 has 4 divisors (see below), whose sum is σ = 21058519219200. Its totient is φ = 20941527445044.

The previous prime is 21000023332117. The next prime is 21000023332151. The reversal of 21000023332121 is 12123332000012.

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 21000023332121 - 2² = 21000023332117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000023332093 and 21000023332102.

It is not an unprimeable number, because it can be changed into a prime (21000023332151) 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, 29247943001 + ... + 29247943718.

It is an arithmetic number, because the mean of its divisors is an integer number (5264629804800).

Almost surely, 2^{21000023332121} is an apocalyptic number.

It is an amenable number.

21000023332121 is a deficient number, since it is larger than the sum of its proper divisors (58495887079).

21000023332121 is an equidigital number, since it uses as much as digits as its factorization.

21000023332121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58495887078.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21000023332121 its reverse (12123332000012), we get a palindrome (33123355332133).

The spelling of 21000023332121 in words is "twenty-one trillion, twenty-three million, three hundred thirty-two thousand, one hundred twenty-one".