213423321431 has 4 divisors (see below), whose sum is σ = 214981156032. Its totient is φ = 211865486832.

The previous prime is 213423321421. The next prime is 213423321437. The reversal of 213423321431 is 134123324312.

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 213423321431 - 2¹⁸ = 213423059287 is a prime.

It is a super-2 number, since 2×213423321431² (a number of 23 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 = 213423321394 and 213423321403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213423321437) 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, 778917095 + ... + 778917368.

It is an arithmetic number, because the mean of its divisors is an integer number (53745289008).

Almost surely, 2^213423321431 is an apocalyptic number.

213423321431 is a deficient number, since it is larger than the sum of its proper divisors (1557834601).

213423321431 is a wasteful number, since it uses less digits than its factorization.

213423321431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557834600.

The product of its digits is 10368, while the sum is 29.

Adding to 213423321431 its reverse (134123324312), we get a palindrome (347546645743).

The spelling of 213423321431 in words is "two hundred thirteen billion, four hundred twenty-three million, three hundred twenty-one thousand, four hundred thirty-one".