121443555243 has 4 divisors (see below), whose sum is σ = 161924740328. Its totient is φ = 80962370160.

The previous prime is 121443555221. The next prime is 121443555283. The reversal of 121443555243 is 342555344121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121443555243 - 2¹⁶ = 121443489707 is a prime.

It is a super-2 number, since 2×121443555243² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121443555283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20240592538 + ... + 20240592543.

It is an arithmetic number, because the mean of its divisors is an integer number (40481185082).

Almost surely, 2^121443555243 is an apocalyptic number.

121443555243 is a deficient number, since it is larger than the sum of its proper divisors (40481185085).

121443555243 is an equidigital number, since it uses as much as digits as its factorization.

121443555243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40481185084.

The product of its digits is 288000, while the sum is 39.

Adding to 121443555243 its reverse (342555344121), we get a palindrome (463998899364).

The spelling of 121443555243 in words is "one hundred twenty-one billion, four hundred forty-three million, five hundred fifty-five thousand, two hundred forty-three".