12121222021020 has 216 divisors, whose sum is σ = 45286515774864. Its totient is φ = 2607590587392.

The previous prime is 12121222020989. The next prime is 12121222021043. The reversal of 12121222021020 is 2012022212121.

It is a happy number.

12121222021020 is a `hidden beast` number, since 1 + 2 + 1 + 212 + 220 + 210 + 20 = 666.

12121222021020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 12121222020984 and 12121222021002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40270302 + ... + 40570181.

It is an arithmetic number, because the mean of its divisors is an integer number (209659795254).

Almost surely, 2^{12121222021020} is an apocalyptic number.

12121222021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121222021020 is an abundant number, since it is smaller than the sum of its proper divisors (33165293753844).

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

12121222021020 is a wasteful number, since it uses less digits than its factorization.

12121222021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80840529 (or 80840517 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121222021020 its reverse (2012022212121), we get a palindrome (14133244233141).

The spelling of 12121222021020 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, twenty".