121331131100123 has 4 divisors (see below), whose sum is σ = 138664149828720. Its totient is φ = 103998112371528.

The previous prime is 121331131100117. The next prime is 121331131100147. The reversal of 121331131100123 is 321001131133121.

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

It is a cyclic number.

It is not a de Polignac number, because 121331131100123 - 2²⁸ = 121330862664667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121331131102123) 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, 8666509364288 + ... + 8666509364301.

It is an arithmetic number, because the mean of its divisors is an integer number (34666037457180).

Almost surely, 2^{121331131100123} is an apocalyptic number.

121331131100123 is a deficient number, since it is larger than the sum of its proper divisors (17333018728597).

121331131100123 is an equidigital number, since it uses as much as digits as its factorization.

121331131100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17333018728596.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 121331131100123 its reverse (321001131133121), we get a palindrome (442332262233244).

The spelling of 121331131100123 in words is "one hundred twenty-one trillion, three hundred thirty-one billion, one hundred thirty-one million, one hundred thousand, one hundred twenty-three".