121043231605355 has 4 divisors (see below), whose sum is σ = 145251877926432. Its totient is φ = 96834585284280.

The previous prime is 121043231605271. The next prime is 121043231605363. The reversal of 121043231605355 is 553506132340121.

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

It is not a de Polignac number, because 121043231605355 - 2¹⁰ = 121043231604331 is a prime.

It is a super-2 number, since 2×121043231605355² (a number of 29 digits) contains 22 as substring.

It is a Duffinian 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, 12104323160531 + ... + 12104323160540.

It is an arithmetic number, because the mean of its divisors is an integer number (36312969481608).

Almost surely, 2^{121043231605355} is an apocalyptic number.

121043231605355 is a deficient number, since it is larger than the sum of its proper divisors (24208646321077).

121043231605355 is an equidigital number, since it uses as much as digits as its factorization.

121043231605355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24208646321076.

The product of its (nonzero) digits is 324000, while the sum is 41.

Adding to 121043231605355 its reverse (553506132340121), we get a palindrome (674549363945476).

The spelling of 121043231605355 in words is "one hundred twenty-one trillion, forty-three billion, two hundred thirty-one million, six hundred five thousand, three hundred fifty-five".