1212212021020 has 192 divisors, whose sum is σ = 3421956787200. Its totient is φ = 348357335040.

The previous prime is 1212212021003. The next prime is 1212212021071. The reversal of 1212212021020 is 201202122121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1212212020985 and 1212212021003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17161936 + ... + 17232424.

It is an arithmetic number, because the mean of its divisors is an integer number (17822691600).

Almost surely, 2^{1212212021020} is an apocalyptic number.

1212212021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212212021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710978393600).

1212212021020 is an abundant number, since it is smaller than the sum of its proper divisors (2209744766180).

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

1212212021020 is a wasteful number, since it uses less digits than its factorization.

1212212021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71388 (or 71386 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212212021020 its reverse (201202122121), we get a palindrome (1413414143141).

The spelling of 1212212021020 in words is "one trillion, two hundred twelve billion, two hundred twelve million, twenty-one thousand, twenty".