12122121111021 has 48 divisors (see below), whose sum is σ = 17831852438400. Its totient is φ = 7934132557824.

The previous prime is 12122121110971. The next prime is 12122121111029. The reversal of 12122121111021 is 12011112122121.

It is a happy number.

12122121111021 is a `hidden beast` number, since 121 + 221 + 211 + 110 + 2 + 1 = 666.

12122121111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12122121111021 - 2²² = 12122116916717 is a prime.

It is a super-2 number, since 2×12122121111021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12122121110985 and 12122121111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122121111029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124220770 + ... + 124318316.

It is an arithmetic number, because the mean of its divisors is an integer number (371496925800).

Almost surely, 2^{12122121111021} is an apocalyptic number.

It is an amenable number.

12122121111021 is a deficient number, since it is larger than the sum of its proper divisors (5709731327379).

12122121111021 is a wasteful number, since it uses less digits than its factorization.

12122121111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98738 (or 98735 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12122121111021 its reverse (12011112122121), we get a palindrome (24133233233142).

The spelling of 12122121111021 in words is "twelve trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, twenty-one".