243121021534 has 8 divisors (see below), whose sum is σ = 365276446920. Its totient is φ = 121362205896.

The previous prime is 243121021513. The next prime is 243121021543. The reversal of 243121021534 is 435120121342.

243121021534 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×243121021534² (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 3 ways as a sum of consecutive naturals, for example, 99150904 + ... + 99153355.

It is an arithmetic number, because the mean of its divisors is an integer number (45659555865).

Almost surely, 2^243121021534 is an apocalyptic number.

243121021534 is a deficient number, since it is larger than the sum of its proper divisors (122155425386).

243121021534 is a wasteful number, since it uses less digits than its factorization.

243121021534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198304874.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 243121021534 its reverse (435120121342), we get a palindrome (678241142876).

The spelling of 243121021534 in words is "two hundred forty-three billion, one hundred twenty-one million, twenty-one thousand, five hundred thirty-four".