211230031321 has 4 divisors (see below), whose sum is σ = 211286985700. Its totient is φ = 211173076944.

The previous prime is 211230031301. The next prime is 211230031351. The reversal of 211230031321 is 123130032112.

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 135309944025 + 75920087296 = 367845^2 + 275536^2 .

It is a cyclic number.

It is not a de Polignac number, because 211230031321 - 2¹¹ = 211230029273 is a prime.

It is a super-2 number, since 2×211230031321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211230031301) 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, 28471626 + ... + 28479043.

It is an arithmetic number, because the mean of its divisors is an integer number (52821746425).

Almost surely, 2^211230031321 is an apocalyptic number.

It is an amenable number.

211230031321 is a deficient number, since it is larger than the sum of its proper divisors (56954379).

211230031321 is an equidigital number, since it uses as much as digits as its factorization.

211230031321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56954378.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 211230031321 its reverse (123130032112), we get a palindrome (334360063433).

The spelling of 211230031321 in words is "two hundred eleven billion, two hundred thirty million, thirty-one thousand, three hundred twenty-one".