211313123221 has 4 divisors (see below), whose sum is σ = 214777272844. Its totient is φ = 207848973600.

The previous prime is 211313123183. The next prime is 211313123243. The reversal of 211313123221 is 122321313112.

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 6000826225 + 205312296996 = 77465^2 + 453114^2 .

It is a cyclic number.

It is not a de Polignac number, because 211313123221 - 2²⁵ = 211279568789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211313123192 and 211313123201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211313123261) 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, 1732074720 + ... + 1732074841.

It is an arithmetic number, because the mean of its divisors is an integer number (53694318211).

Almost surely, 2^211313123221 is an apocalyptic number.

It is an amenable number.

211313123221 is a deficient number, since it is larger than the sum of its proper divisors (3464149623).

211313123221 is an equidigital number, since it uses as much as digits as its factorization.

211313123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464149622.

The product of its digits is 432, while the sum is 22.

Adding to 211313123221 its reverse (122321313112), we get a palindrome (333634436333).

The spelling of 211313123221 in words is "two hundred eleven billion, three hundred thirteen million, one hundred twenty-three thousand, two hundred twenty-one".