121212221220123 has 32 divisors (see below), whose sum is σ = 176404247027712. Its totient is φ = 73422145024800.

The previous prime is 121212221220071. The next prime is 121212221220161. The reversal of 121212221220123 is 321022122212121.

It is not a de Polignac number, because 121212221220123 - 2²¹ = 121212219122971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121212221220093 and 121212221220102.

It is not an unprimeable number, because it can be changed into a prime (121212221220163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495254286 + ... + 495498972.

It is an arithmetic number, because the mean of its divisors is an integer number (5512632719616).

Almost surely, 2^{121212221220123} is an apocalyptic number.

121212221220123 is a deficient number, since it is larger than the sum of its proper divisors (55192025807589).

121212221220123 is a wasteful number, since it uses less digits than its factorization.

121212221220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252775.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 121212221220123 its reverse (321022122212121), we get a palindrome (442234343432244).

The spelling of 121212221220123 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-three".