213434431 has 8 divisors (see below), whose sum is σ = 244270080. Its totient is φ = 182685048.

The previous prime is 213434401. The next prime is 213434471. The reversal of 213434431 is 134434312.

213434431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213434431 - 2⁵ = 213434399 is a prime.

It is a super-2 number, since 2×213434431² = 91108512672587522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213434396 and 213434405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213434401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16171 + ... + 26236.

It is an arithmetic number, because the mean of its divisors is an integer number (30533760).

Almost surely, 2^213434431 is an apocalyptic number.

213434431 is a deficient number, since it is larger than the sum of its proper divisors (30835649).

213434431 is an equidigital number, since it uses as much as digits as its factorization.

213434431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43133.

The product of its digits is 3456, while the sum is 25.

The square root of 213434431 is about 14609.3952989164. The cubic root of 213434431 is about 597.6150053773.

Adding to 213434431 its reverse (134434312), we get a palindrome (347868743).

The spelling of 213434431 in words is "two hundred thirteen million, four hundred thirty-four thousand, four hundred thirty-one".