20120121021200 has 60 divisors (see below), whose sum is σ = 48340440250788. Its totient is φ = 8047740480000.

The previous prime is 20120121021071. The next prime is 20120121021211. The reversal of 20120121021200 is 212012102102.

It can be written as a sum of positive squares in 6 ways, for example, as 3473198777104 + 16646922244096 = 1863652^2 + 4080064^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9651374 + ... + 11549426.

Almost surely, 2^{20120121021200} is an apocalyptic number.

20120121021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120121021200 is an abundant number, since it is smaller than the sum of its proper divisors (28220319229588).

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

20120121021200 is a wasteful number, since it uses less digits than its factorization.

20120121021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924572 (or 1924561 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20120121021200 its reverse (212012102102), we get a palindrome (20332133123302).

The spelling of 20120121021200 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-one million, twenty-one thousand, two hundred".