213442131 has 8 divisors (see below), whose sum is σ = 325245184. Its totient is φ = 121966920.

The previous prime is 213442091. The next prime is 213442147. The reversal of 213442131 is 131244312.

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

It is not a de Polignac number, because 213442131 - 2¹⁴ = 213425747 is a prime.

It is a super-2 number, since 2×213442131² = 91115086571642322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10163911 = 213442131 / (2 + 1 + 3 + 4 + 4 + 2 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213442098 and 213442107.

It is not an unprimeable number, because it can be changed into a prime (213442171) 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, 5081935 + ... + 5081976.

It is an arithmetic number, because the mean of its divisors is an integer number (40655648).

Almost surely, 2^213442131 is an apocalyptic number.

213442131 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

213442131 is a deficient number, since it is larger than the sum of its proper divisors (111803053).

213442131 is a wasteful number, since it uses less digits than its factorization.

213442131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163921.

The product of its digits is 576, while the sum is 21.

The square root of 213442131 is about 14609.6588255852. The cubic root of 213442131 is about 597.6221919407.

Adding to 213442131 its reverse (131244312), we get a palindrome (344686443).

The spelling of 213442131 in words is "two hundred thirteen million, four hundred forty-two thousand, one hundred thirty-one".