1221020122120 has 32 divisors (see below), whose sum is σ = 2747641518720. Its totient is φ = 488346494400.

The previous prime is 1221020122097. The next prime is 1221020122123. The reversal of 1221020122120 is 212210201221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221020122094 and 1221020122103.

It is not an unprimeable number, because it can be changed into a prime (1221020122123) 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 7 ways as a sum of consecutive naturals, for example, 1601562 + ... + 2237641.

It is an arithmetic number, because the mean of its divisors is an integer number (85863797460).

Almost surely, 2^{1221020122120} is an apocalyptic number.

1221020122120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221020122120 is an abundant number, since it is smaller than the sum of its proper divisors (1526621396600).

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

1221020122120 is a wasteful number, since it uses less digits than its factorization.

1221020122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3847165 (or 3847161 counting only the distinct ones).

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

Adding to 1221020122120 its reverse (212210201221), we get a palindrome (1433230323341).

The spelling of 1221020122120 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty".