243121222215 has 12 divisors (see below), whose sum is σ = 421410118584. Its totient is φ = 129664651824.

The previous prime is 243121222177. The next prime is 243121222237. The reversal of 243121222215 is 512222121342.

243121222215 is a `hidden beast` number, since 2 + 4 + 312 + 122 + 221 + 5 = 666.

It is not a de Polignac number, because 243121222215 - 2⁹ = 243121221703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2701346869 + ... + 2701346958.

It is an arithmetic number, because the mean of its divisors is an integer number (35117509882).

Almost surely, 2^243121222215 is an apocalyptic number.

243121222215 is a deficient number, since it is larger than the sum of its proper divisors (178288896369).

243121222215 is a wasteful number, since it uses less digits than its factorization.

243121222215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402693838 (or 5402693835 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

Adding to 243121222215 its reverse (512222121342), we get a palindrome (755343343557).

The spelling of 243121222215 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred fifteen".