211312220321 has 4 divisors (see below), whose sum is σ = 211354294272. Its totient is φ = 211270146372.

The previous prime is 211312220303. The next prime is 211312220341. The reversal of 211312220321 is 123022213112.

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 211312220321 - 2¹⁰ = 211312219297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211312220293 and 211312220302.

It is not an unprimeable number, because it can be changed into a prime (211312220341) 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, 21029441 + ... + 21039486.

It is an arithmetic number, because the mean of its divisors is an integer number (52838573568).

Almost surely, 2^211312220321 is an apocalyptic number.

It is an amenable number.

211312220321 is a deficient number, since it is larger than the sum of its proper divisors (42073951).

211312220321 is an equidigital number, since it uses as much as digits as its factorization.

211312220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42073950.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211312220321 its reverse (123022213112), we get a palindrome (334334433433).

The spelling of 211312220321 in words is "two hundred eleven billion, three hundred twelve million, two hundred twenty thousand, three hundred twenty-one".