213224131 has 4 divisors (see below), whose sum is σ = 213756264. Its totient is φ = 212692000.

The previous prime is 213224119. The next prime is 213224177. The reversal of 213224131 is 131422312.

It is a happy number.

213224131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213224131 is a prime.

It is a super-2 number, since 2×213224131² = 90929060081410322, 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 = 213224099 and 213224108.

It is not an unprimeable number, because it can be changed into a prime (213264131) 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, 265465 + ... + 266266.

It is an arithmetic number, because the mean of its divisors is an integer number (53439066).

Almost surely, 2^213224131 is an apocalyptic number.

213224131 is a deficient number, since it is larger than the sum of its proper divisors (532133).

213224131 is an equidigital number, since it uses as much as digits as its factorization.

213224131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532132.

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

The square root of 213224131 is about 14602.1961019567. The cubic root of 213224131 is about 597.4186613366.

Adding to 213224131 its reverse (131422312), we get a palindrome (344646443).

The spelling of 213224131 in words is "two hundred thirteen million, two hundred twenty-four thousand, one hundred thirty-one".