211321220213 has 4 divisors (see below), whose sum is σ = 211326167148. Its totient is φ = 211316273280.

The previous prime is 211321220203. The next prime is 211321220233. The reversal of 211321220213 is 312022123112.

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 146124236644 + 65196983569 = 382262^2 + 255337^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321220213 - 2¹⁴ = 211321203829 is a prime.

It is a super-2 number, since 2×211321220213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211321220203) 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, 2408828 + ... + 2495013.

It is an arithmetic number, because the mean of its divisors is an integer number (52831541787).

Almost surely, 2^211321220213 is an apocalyptic number.

It is an amenable number.

211321220213 is a deficient number, since it is larger than the sum of its proper divisors (4946935).

211321220213 is an equidigital number, since it uses as much as digits as its factorization.

211321220213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946934.

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

Adding to 211321220213 its reverse (312022123112), we get a palindrome (523343343325).

The spelling of 211321220213 in words is "two hundred eleven billion, three hundred twenty-one million, two hundred twenty thousand, two hundred thirteen".