1212012221020 has 96 divisors (see below), whose sum is σ = 2643137925120. Its totient is φ = 466350981120.

The previous prime is 1212012221011. The next prime is 1212012221041. The reversal of 1212012221020 is 201222102121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1212012220985 and 1212012221003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77590771 + ... + 77606389.

It is an arithmetic number, because the mean of its divisors is an integer number (27532686720).

Almost surely, 2^{1212012221020} is an apocalyptic number.

1212012221020 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 1212012221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1321568962560).

1212012221020 is an abundant number, since it is smaller than the sum of its proper divisors (1431125704100).

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

1212012221020 is a wasteful number, since it uses less digits than its factorization.

1212012221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16403 (or 16401 counting only the distinct ones).

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

Adding to 1212012221020 its reverse (201222102121), we get a palindrome (1413234323141).

The spelling of 1212012221020 in words is "one trillion, two hundred twelve billion, twelve million, two hundred twenty-one thousand, twenty".