20210121200 has 60 divisors (see below), whose sum is σ = 49279580280. Its totient is φ = 7963380480.

The previous prime is 20210121089. The next prime is 20210121209. The reversal of 20210121200 is 212101202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210121209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350255 + ... + 403854.

It is an arithmetic number, because the mean of its divisors is an integer number (821326338).

Almost surely, 2^20210121200 is an apocalyptic number.

20210121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20210121200 is an abundant number, since it is smaller than the sum of its proper divisors (29069459080).

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

20210121200 is a wasteful number, since it uses less digits than its factorization.

20210121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754194 (or 754183 counting only the distinct ones).

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

Adding to 20210121200 its reverse (212101202), we get a palindrome (20422222402).

The spelling of 20210121200 in words is "twenty billion, two hundred ten million, one hundred twenty-one thousand, two hundred".