211320121331321 has 4 divisors (see below), whose sum is σ = 211394087074932. Its totient is φ = 211246155587712.

The previous prime is 211320121331279. The next prime is 211320121331329. The reversal of 211320121331321 is 123133121023112.

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 160289171807296 + 51030949524025 = 12660536^2 + 7143595^2 .

It is a cyclic number.

It is not a de Polignac number, because 211320121331321 - 2¹⁸ = 211320121069177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211320121331329) 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, 36982867520 + ... + 36982873233.

It is an arithmetic number, because the mean of its divisors is an integer number (52848521768733).

Almost surely, 2^{211320121331321} is an apocalyptic number.

It is an amenable number.

211320121331321 is a deficient number, since it is larger than the sum of its proper divisors (73965743611).

211320121331321 is an equidigital number, since it uses as much as digits as its factorization.

211320121331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73965743610.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 211320121331321 its reverse (123133121023112), we get a palindrome (334453242354433).

The spelling of 211320121331321 in words is "two hundred eleven trillion, three hundred twenty billion, one hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty-one".