243121221434 has 64 divisors (see below), whose sum is σ = 456458284800. Its totient is φ = 94548971520.

The previous prime is 243121221419. The next prime is 243121221461. The reversal of 243121221434 is 434122121342.

It is a super-2 number, since 2×243121221434² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243121221397 and 243121221406.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23297882 + ... + 23308314.

It is an arithmetic number, because the mean of its divisors is an integer number (7132160700).

Almost surely, 2^243121221434 is an apocalyptic number.

243121221434 is a deficient number, since it is larger than the sum of its proper divisors (213337063366).

243121221434 is a wasteful number, since it uses less digits than its factorization.

243121221434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12615.

The product of its digits is 9216, while the sum is 29.

Adding to 243121221434 its reverse (434122121342), we get a palindrome (677243342776).

The spelling of 243121221434 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-one thousand, four hundred thirty-four".