243130311221 has 16 divisors (see below), whose sum is σ = 294225208704. Its totient is φ = 196127337984.

The previous prime is 243130311199. The next prime is 243130311223. The reversal of 243130311221 is 122113031342.

It is a cyclic number.

It is not a de Polignac number, because 243130311221 - 2¹⁰ = 243130310197 is a prime.

It is a super-2 number, since 2×243130311221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243130311223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2434946 + ... + 2532828.

It is an arithmetic number, because the mean of its divisors is an integer number (18389075544).

Almost surely, 2^243130311221 is an apocalyptic number.

It is an amenable number.

243130311221 is a deficient number, since it is larger than the sum of its proper divisors (51094897483).

243130311221 is a wasteful number, since it uses less digits than its factorization.

243130311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118780.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 243130311221 its reverse (122113031342), we get a palindrome (365243342563).

The spelling of 243130311221 in words is "two hundred forty-three billion, one hundred thirty million, three hundred eleven thousand, two hundred twenty-one".