213401231 has 4 divisors (see below), whose sum is σ = 216586392. Its totient is φ = 210216072.

The previous prime is 213401213. The next prime is 213401233. The reversal of 213401231 is 132104312.

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

It is a cyclic number.

It is not a de Polignac number, because 213401231 - 2²² = 209206927 is a prime.

It is a super-2 number, since 2×213401231² = 91080170784630722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213401233) 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, 1592480 + ... + 1592613.

It is an arithmetic number, because the mean of its divisors is an integer number (54146598).

Almost surely, 2^213401231 is an apocalyptic number.

213401231 is a deficient number, since it is larger than the sum of its proper divisors (3185161).

213401231 is an equidigital number, since it uses as much as digits as its factorization.

213401231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185160.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 213401231 is about 14608.2589996207. The cubic root of 213401231 is about 597.5840171765.

Adding to 213401231 its reverse (132104312), we get a palindrome (345505543).

The spelling of 213401231 in words is "two hundred thirteen million, four hundred one thousand, two hundred thirty-one".