210133121321 has 4 divisors (see below), whose sum is σ = 215258319444. Its totient is φ = 205007923200.

The previous prime is 210133121279. The next prime is 210133121327. The reversal of 210133121321 is 123121331012.

It is a happy number.

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 45118432921 + 165014688400 = 212411^2 + 406220^2 .

It is a cyclic number.

It is not a de Polignac number, because 210133121321 - 2¹⁰ = 210133120297 is a prime.

It is a super-2 number, since 2×210133121321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210133121293 and 210133121302.

It is not an unprimeable number, because it can be changed into a prime (210133121327) 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, 2562599000 + ... + 2562599081.

It is an arithmetic number, because the mean of its divisors is an integer number (53814579861).

Almost surely, 2^210133121321 is an apocalyptic number.

It is an amenable number.

210133121321 is a deficient number, since it is larger than the sum of its proper divisors (5125198123).

210133121321 is an equidigital number, since it uses as much as digits as its factorization.

210133121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125198122.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 210133121321 its reverse (123121331012), we get a palindrome (333254452333).

The spelling of 210133121321 in words is "two hundred ten billion, one hundred thirty-three million, one hundred twenty-one thousand, three hundred twenty-one".