12122121021021 has 128 divisors (see below), whose sum is σ = 20862547660800. Its totient is φ = 6875090196480.

The previous prime is 12122121021019. The next prime is 12122121021037. The reversal of 12122121021021 is 12012012122121.

12122121021021 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 210 + 210 + 21 = 666.

It is not a de Polignac number, because 12122121021021 - 2¹ = 12122121021019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12122121020985 and 12122121021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122121021011) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 628959441 + ... + 628978713.

It is an arithmetic number, because the mean of its divisors is an integer number (162988653600).

Almost surely, 2^{12122121021021} is an apocalyptic number.

12122121021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122121021021 is a deficient number, since it is larger than the sum of its proper divisors (8740426639779).

12122121021021 is a wasteful number, since it uses less digits than its factorization.

12122121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20016 (or 20010 counting only the distinct ones).

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

Adding to 12122121021021 its reverse (12012012122121), we get a palindrome (24134133143142).

The spelling of 12122121021021 in words is "twelve trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, twenty-one".