243121213401 has 32 divisors (see below), whose sum is σ = 364704350208. Its totient is φ = 142786203840.

The previous prime is 243121213373. The next prime is 243121213499. The reversal of 243121213401 is 104312121342.

It is not a de Polignac number, because 243121213401 - 2⁵ = 243121213369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243121211401) 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, 494326 + ... + 854751.

It is an arithmetic number, because the mean of its divisors is an integer number (11397010944).

Almost surely, 2^243121213401 is an apocalyptic number.

It is an amenable number.

243121213401 is a deficient number, since it is larger than the sum of its proper divisors (121583136807).

243121213401 is a wasteful number, since it uses less digits than its factorization.

243121213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349261.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 243121213401 its reverse (104312121342), we get a palindrome (347433334743).

The spelling of 243121213401 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred thirteen thousand, four hundred one".