1212221020220 has 48 divisors (see below), whose sum is σ = 2912130923520. Its totient is φ = 415218567744.

The previous prime is 1212221020211. The next prime is 1212221020223. The reversal of 1212221020220 is 220201222121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212221020223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4021394 + ... + 4312313.

It is an arithmetic number, because the mean of its divisors is an integer number (60669394240).

Almost surely, 2^{1212221020220} is an apocalyptic number.

1212221020220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221020220 is an abundant number, since it is smaller than the sum of its proper divisors (1699909903300).

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

1212221020220 is a wasteful number, since it uses less digits than its factorization.

1212221020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8334762 (or 8334760 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1212221020220 its reverse (220201222121), we get a palindrome (1432422242341).

The spelling of 1212221020220 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twenty thousand, two hundred twenty".