121212120121020 has 144 divisors (see below), whose sum is σ = 381308538619008. Its totient is φ = 32322035361600.

The previous prime is 121212120120991. The next prime is 121212120121033. The reversal of 121212120121020 is 20121021212121.

121212120121020 is a `hidden beast` number, since 1 + 21 + 212 + 1 + 201 + 210 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121212120120984 and 121212120121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134908107 + ... + 135803613.

It is an arithmetic number, because the mean of its divisors is an integer number (2647975962632).

Almost surely, 2^{121212120121020} is an apocalyptic number.

121212120121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212120121020 is an abundant number, since it is smaller than the sum of its proper divisors (260096418497988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121212120121020 is a wasteful number, since it uses less digits than its factorization.

121212120121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923382 (or 923368 counting only the distinct ones).

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

Adding to 121212120121020 its reverse (20121021212121), we get a palindrome (141333141333141).

The spelling of 121212120121020 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand, twenty".