20120121200 has 60 divisors (see below), whose sum is σ = 48359326680. Its totient is φ = 8044596480.

The previous prime is 20120121199. The next prime is 20120121211. The reversal of 20120121200 is 212102102.

It is a happy number.

It is a congruent number.

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, 1054142 + ... + 1073058.

It is an arithmetic number, because the mean of its divisors is an integer number (805988778).

Almost surely, 2^20120121200 is an apocalyptic number.

20120121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20120121200 is an abundant number, since it is smaller than the sum of its proper divisors (28239205480).

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

20120121200 is a wasteful number, since it uses less digits than its factorization.

20120121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21594 (or 21583 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20120121200 its reverse (212102102), we get a palindrome (20332223302).

The spelling of 20120121200 in words is "twenty billion, one hundred twenty million, one hundred twenty-one thousand, two hundred".