243143421021 has 24 divisors (see below), whose sum is σ = 370030271520. Its totient is φ = 153423650016.

The previous prime is 243143420999. The next prime is 243143421049. The reversal of 243143421021 is 120124341342.

243143421021 is a `hidden beast` number, since 2 + 4 + 314 + 342 + 1 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 243143421021 - 2⁷ = 243143420893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243543421021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 463551 + ... + 837356.

It is an arithmetic number, because the mean of its divisors is an integer number (15417927980).

Almost surely, 2^243143421021 is an apocalyptic number.

It is an amenable number.

243143421021 is a deficient number, since it is larger than the sum of its proper divisors (126886850499).

243143421021 is a wasteful number, since it uses less digits than its factorization.

243143421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302025 (or 1302022 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 243143421021 its reverse (120124341342), we get a palindrome (363267762363).

The spelling of 243143421021 in words is "two hundred forty-three billion, one hundred forty-three million, four hundred twenty-one thousand, twenty-one".