12121222121020 has 24 divisors (see below), whose sum is σ = 25463048608368. Its totient is φ = 4846873200000.

The previous prime is 12121222121017. The next prime is 12121222121039. The reversal of 12121222121020 is 2012122212121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100916506 + ... + 101036545.

It is an arithmetic number, because the mean of its divisors is an integer number (1060960358682).

Almost surely, 2^{12121222121020} is an apocalyptic number.

12121222121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121222121020 is an abundant number, since it is smaller than the sum of its proper divisors (13341826487348).

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

12121222121020 is a wasteful number, since it uses less digits than its factorization.

12121222121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201956061 (or 201956059 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12121222121020 its reverse (2012122212121), we get a palindrome (14133344333141).

The spelling of 12121222121020 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty".