243131143421 has 4 divisors (see below), whose sum is σ = 243297787200. Its totient is φ = 242964499644.

The previous prime is 243131143403. The next prime is 243131143427. The reversal of 243131143421 is 124341131342.

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 243131143421 - 2⁶ = 243131143357 is a prime.

It is a super-2 number, since 2×243131143421² (a number of 24 digits) 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 (243131143427) 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, 83319701 + ... + 83322618.

It is an arithmetic number, because the mean of its divisors is an integer number (60824446800).

Almost surely, 2^243131143421 is an apocalyptic number.

It is an amenable number.

243131143421 is a deficient number, since it is larger than the sum of its proper divisors (166643779).

243131143421 is a wasteful number, since it uses less digits than its factorization.

243131143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166643778.

The product of its digits is 6912, while the sum is 29.

Adding to 243131143421 its reverse (124341131342), we get a palindrome (367472274763).

The spelling of 243131143421 in words is "two hundred forty-three billion, one hundred thirty-one million, one hundred forty-three thousand, four hundred twenty-one".