21321033210121 has 4 divisors (see below), whose sum is σ = 21333336173892. Its totient is φ = 21308730246352.

The previous prime is 21321033210107. The next prime is 21321033210131. The reversal of 21321033210121 is 12101233012312.

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 8028183894025 + 13292849316096 = 2833405^2 + 3645936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321033210121 - 2¹³ = 21321033201929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321033210092 and 21321033210101.

It is not an unprimeable number, because it can be changed into a prime (21321033210131) 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, 6151479286 + ... + 6151482751.

It is an arithmetic number, because the mean of its divisors is an integer number (5333334043473).

Almost surely, 2^{21321033210121} is an apocalyptic number.

It is an amenable number.

21321033210121 is a deficient number, since it is larger than the sum of its proper divisors (12302963771).

21321033210121 is a wasteful number, since it uses less digits than its factorization.

21321033210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12302963770.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21321033210121 its reverse (12101233012312), we get a palindrome (33422266222433).

The spelling of 21321033210121 in words is "twenty-one trillion, three hundred twenty-one billion, thirty-three million, two hundred ten thousand, one hundred twenty-one".