243121201005 has 16 divisors (see below), whose sum is σ = 389004200640. Its totient is φ = 129661214208.

The previous prime is 243121200967. The next prime is 243121201123. The reversal of 243121201005 is 500102121342.

It is not a de Polignac number, because 243121201005 - 2⁶ = 243121200941 is a prime.

It is a super-2 number, since 2×243121201005² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 436126 + ... + 822464.

It is an arithmetic number, because the mean of its divisors is an integer number (24312762540).

Almost surely, 2^243121201005 is an apocalyptic number.

It is an amenable number.

243121201005 is a deficient number, since it is larger than the sum of its proper divisors (145882999635).

243121201005 is a wasteful number, since it uses less digits than its factorization.

243121201005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428300.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 243121201005 its reverse (500102121342), we get a palindrome (743223322347).

The spelling of 243121201005 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred one thousand, five".