213104431 has 4 divisors (see below), whose sum is σ = 218060392. Its totient is φ = 208148472.

The previous prime is 213104413. The next prime is 213104449. The reversal of 213104431 is 134401312.

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

It is an interprime number because it is at equal distance from previous prime (213104413) and next prime (213104449).

It is a cyclic number.

It is not a de Polignac number, because 213104431 - 2¹⁷ = 212973359 is a prime.

It is a super-2 number, since 2×213104431² = 90826997023667522, 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 = 213104399 and 213104408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213104461) 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, 2477916 + ... + 2478001.

It is an arithmetic number, because the mean of its divisors is an integer number (54515098).

Almost surely, 2^213104431 is an apocalyptic number.

213104431 is a deficient number, since it is larger than the sum of its proper divisors (4955961).

213104431 is an equidigital number, since it uses as much as digits as its factorization.

213104431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955960.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 213104431 is about 14598.0968280115. The cubic root of 213104431 is about 597.3068472262.

Adding to 213104431 its reverse (134401312), we get a palindrome (347505743).

The spelling of 213104431 in words is "two hundred thirteen million, one hundred four thousand, four hundred thirty-one".