211222001321 has 4 divisors (see below), whose sum is σ = 212763767892. Its totient is φ = 209680234752.

The previous prime is 211222001297. The next prime is 211222001327. The reversal of 211222001321 is 123100222112.

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 175402653721 + 35819347600 = 418811^2 + 189260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211222001321 is a prime.

It is a super-2 number, since 2×211222001321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211222001321.

It is not an unprimeable number, because it can be changed into a prime (211222001327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770883080 + ... + 770883353.

It is an arithmetic number, because the mean of its divisors is an integer number (53190941973).

Almost surely, 2^211222001321 is an apocalyptic number.

It is an amenable number.

211222001321 is a deficient number, since it is larger than the sum of its proper divisors (1541766571).

211222001321 is a wasteful number, since it uses less digits than its factorization.

211222001321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541766570.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 211222001321 its reverse (123100222112), we get a palindrome (334322223433).

The spelling of 211222001321 in words is "two hundred eleven billion, two hundred twenty-two million, one thousand, three hundred twenty-one".