213123221223331 has 4 divisors (see below), whose sum is σ = 217657757845152. Its totient is φ = 208588684601512.

The previous prime is 213123221223313. The next prime is 213123221223343. The reversal of 213123221223331 is 133322122321312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213123221223331 - 2⁷ = 213123221223203 is a prime.

It is a super-2 number, since 2×213123221223331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213123221223293 and 213123221223302.

It is not an unprimeable number, because it can be changed into a prime (213123221263331) 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, 2267268310840 + ... + 2267268310933.

It is an arithmetic number, because the mean of its divisors is an integer number (54414439461288).

Almost surely, 2^{213123221223331} is an apocalyptic number.

213123221223331 is a deficient number, since it is larger than the sum of its proper divisors (4534536621821).

213123221223331 is an equidigital number, since it uses as much as digits as its factorization.

213123221223331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534536621820.

The product of its digits is 15552, while the sum is 31.

Adding to 213123221223331 its reverse (133322122321312), we get a palindrome (346445343544643).

The spelling of 213123221223331 in words is "two hundred thirteen trillion, one hundred twenty-three billion, two hundred twenty-one million, two hundred twenty-three thousand, three hundred thirty-one".