213031441 has 4 divisors (see below), whose sum is σ = 243464512. Its totient is φ = 182598372.

The previous prime is 213031421. The next prime is 213031457. The reversal of 213031441 is 144130312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213031441 - 2¹¹ = 213029393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213031421) 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, 15216525 + ... + 15216538.

It is an arithmetic number, because the mean of its divisors is an integer number (60866128).

Almost surely, 2^213031441 is an apocalyptic number.

It is an amenable number.

213031441 is a deficient number, since it is larger than the sum of its proper divisors (30433071).

213031441 is an equidigital number, since it uses as much as digits as its factorization.

213031441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30433070.

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

The square root of 213031441 is about 14595.5966304910. The cubic root of 213031441 is about 597.2386452887.

Adding to 213031441 its reverse (144130312), we get a palindrome (357161753).

The spelling of 213031441 in words is "two hundred thirteen million, thirty-one thousand, four hundred forty-one".