211313331221 has 4 divisors (see below), whose sum is σ = 211318116000. Its totient is φ = 211308546444.

The previous prime is 211313331217. The next prime is 211313331233. The reversal of 211313331221 is 122133313112.

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 211313331221 - 2² = 211313331217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211313331121) 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, 2325521 + ... + 2414678.

It is an arithmetic number, because the mean of its divisors is an integer number (52829529000).

Almost surely, 2^211313331221 is an apocalyptic number.

It is an amenable number.

211313331221 is a deficient number, since it is larger than the sum of its proper divisors (4784779).

211313331221 is an equidigital number, since it uses as much as digits as its factorization.

211313331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4784778.

The product of its digits is 648, while the sum is 23.

Adding to 211313331221 its reverse (122133313112), we get a palindrome (333446644333).

The spelling of 211313331221 in words is "two hundred eleven billion, three hundred thirteen million, three hundred thirty-one thousand, two hundred twenty-one".