213221311423 has 4 divisors (see below), whose sum is σ = 222491803248. Its totient is φ = 203950819600.

The previous prime is 213221311361. The next prime is 213221311441. The reversal of 213221311423 is 324113122312.

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 213221311423 - 2²⁹ = 212684440511 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 (213221311463) 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, 4635245878 + ... + 4635245923.

It is an arithmetic number, because the mean of its divisors is an integer number (55622950812).

Almost surely, 2^213221311423 is an apocalyptic number.

213221311423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

213221311423 is a deficient number, since it is larger than the sum of its proper divisors (9270491825).

213221311423 is an equidigital number, since it uses as much as digits as its factorization.

213221311423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270491824.

The product of its digits is 1728, while the sum is 25.

Adding to 213221311423 its reverse (324113122312), we get a palindrome (537334433735).

The spelling of 213221311423 in words is "two hundred thirteen billion, two hundred twenty-one million, three hundred eleven thousand, four hundred twenty-three".