213143421 has 8 divisors (see below), whose sum is σ = 291872224. Its totient is φ = 138255120.

The previous prime is 213143407. The next prime is 213143423. The reversal of 213143421 is 124341312.

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

It is a de Polignac number, because none of the positive numbers 2^k-213143421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213143423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959995 + ... + 960216.

It is an arithmetic number, because the mean of its divisors is an integer number (36484028).

Almost surely, 2^213143421 is an apocalyptic number.

It is an amenable number.

213143421 is a deficient number, since it is larger than the sum of its proper divisors (78728803).

213143421 is a wasteful number, since it uses less digits than its factorization.

213143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920251.

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

The square root of 213143421 is about 14599.4322149870. The cubic root of 213143421 is about 597.3432731445.

Adding to 213143421 its reverse (124341312), we get a palindrome (337484733).

The spelling of 213143421 in words is "two hundred thirteen million, one hundred forty-three thousand, four hundred twenty-one".