213144431 has 8 divisors (see below), whose sum is σ = 217517328. Its totient is φ = 208800000.

The previous prime is 213144397. The next prime is 213144433. The reversal of 213144431 is 134441312.

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

It is a cyclic number.

It is not a de Polignac number, because 213144431 - 2⁶ = 213144367 is a prime.

It is a super-2 number, since 2×213144431² = 90861096932627522, 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 = 213144397 and 213144406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213144433) 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, 8351 + ... + 22271.

It is an arithmetic number, because the mean of its divisors is an integer number (27189666).

Almost surely, 2^213144431 is an apocalyptic number.

213144431 is a deficient number, since it is larger than the sum of its proper divisors (4372897).

213144431 is a wasteful number, since it uses less digits than its factorization.

213144431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14233.

The product of its digits is 1152, while the sum is 23.

The square root of 213144431 is about 14599.4668053323. The cubic root of 213144431 is about 597.3442166653.

Adding to 213144431 its reverse (134441312), we get a palindrome (347585743).

The spelling of 213144431 in words is "two hundred thirteen million, one hundred forty-four thousand, four hundred thirty-one".