243121222142 has 16 divisors (see below), whose sum is σ = 364947897600. Its totient is φ = 121471959000.

The previous prime is 243121222129. The next prime is 243121222147. The reversal of 243121222142 is 241222121342.

It is a happy number.

It is a super-2 number, since 2×243121222142² (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 (243121222147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22219709 + ... + 22230647.

It is an arithmetic number, because the mean of its divisors is an integer number (22809243600).

Almost surely, 2^243121222142 is an apocalyptic number.

243121222142 is a deficient number, since it is larger than the sum of its proper divisors (121826675458).

243121222142 is a wasteful number, since it uses less digits than its factorization.

243121222142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18031.

The product of its digits is 3072, while the sum is 26.

Adding to 243121222142 its reverse (241222121342), we get a palindrome (484343343484).

The spelling of 243121222142 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred forty-two".