243031221021 has 32 divisors (see below), whose sum is σ = 345466257408. Its totient is φ = 151616868480.

The previous prime is 243031221011. The next prime is 243031221131. The reversal of 243031221021 is 120122130342.

It is not a de Polignac number, because 243031221021 - 2⁵ = 243031220989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243031221011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8648025 + ... + 8676081.

It is an arithmetic number, because the mean of its divisors is an integer number (10795820544).

Almost surely, 2^243031221021 is an apocalyptic number.

It is an amenable number.

243031221021 is a deficient number, since it is larger than the sum of its proper divisors (102435036387).

243031221021 is a wasteful number, since it uses less digits than its factorization.

243031221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30801.

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

Adding to 243031221021 its reverse (120122130342), we get a palindrome (363153351363).

The spelling of 243031221021 in words is "two hundred forty-three billion, thirty-one million, two hundred twenty-one thousand, twenty-one".