121212212121 has 192 divisors, whose sum is σ = 244540907520. Its totient is φ = 55824837120.

The previous prime is 121212212083. The next prime is 121212212123.

121212212121 is a `hidden beast` number, since 121 + 212 + 212 + 121 = 666.

121212212121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 121212212121 - 2¹¹ = 121212210073 is a prime.

121212212121 is a modest number, since divided by 212121 gives 121212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 121212212094 and 121212212103.

It is not an unprimeable number, because it can be changed into a prime (121212212123) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 26331006 + ... + 26335608.

It is an arithmetic number, because the mean of its divisors is an integer number (1273650560).

Almost surely, 2^121212212121 is an apocalyptic number.

121212212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121212212121 is an abundant number, since it is smaller than the sum of its proper divisors (123328695399).

121212212121 is a wasteful number, since it uses less digits than its factorization.

121212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756 (or 4753 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

It can be divided in two parts, 121212 and 212121, that added together give a palindrome (333333).

The spelling of 121212212121 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".