213240433431 has 4 divisors (see below), whose sum is σ = 284320577912. Its totient is φ = 142160288952.

The previous prime is 213240433387. The next prime is 213240433457. The reversal of 213240433431 is 134334042312.

It is a happy number.

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

It is not a de Polignac number, because 213240433431 - 2⁷ = 213240433303 is a prime.

It is a super-2 number, since 2×213240433431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213240433481) 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, 35540072236 + ... + 35540072241.

It is an arithmetic number, because the mean of its divisors is an integer number (71080144478).

Almost surely, 2^213240433431 is an apocalyptic number.

213240433431 is a deficient number, since it is larger than the sum of its proper divisors (71080144481).

213240433431 is an equidigital number, since it uses as much as digits as its factorization.

213240433431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71080144480.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 213240433431 its reverse (134334042312), we get a palindrome (347574475743).

The spelling of 213240433431 in words is "two hundred thirteen billion, two hundred forty million, four hundred thirty-three thousand, four hundred thirty-one".