121212002111123 has 64 divisors (see below), whose sum is σ = 153112650347520. Its totient is φ = 93991221308160.

The previous prime is 121212002111027. The next prime is 121212002111143. The reversal of 121212002111123 is 321111200212121.

It is a de Polignac number, because none of the positive numbers 2^k-121212002111123 is a prime.

It is a super-2 number, since 2×121212002111123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212002111095 and 121212002111104.

It is not an unprimeable number, because it can be changed into a prime (121212002111143) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4593612536 + ... + 4593638922.

It is an arithmetic number, because the mean of its divisors is an integer number (2392385161680).

Almost surely, 2^{121212002111123} is an apocalyptic number.

121212002111123 is a deficient number, since it is larger than the sum of its proper divisors (31900648236397).

121212002111123 is a wasteful number, since it uses less digits than its factorization.

121212002111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28809 (or 28787 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 121212002111123 its reverse (321111200212121), we get a palindrome (442323202323244).

The spelling of 121212002111123 in words is "one hundred twenty-one trillion, two hundred twelve billion, two million, one hundred eleven thousand, one hundred twenty-three".