2121220121200 has 30 divisors (see below), whose sum is σ = 5096231342144. Its totient is φ = 848488048320.

The previous prime is 2121220121183. The next prime is 2121220121201. The reversal of 2121220121200 is 21210221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121220121201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2651524752 + ... + 2651525551.

Almost surely, 2^{2121220121200} is an apocalyptic number.

2121220121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121220121200 is an abundant number, since it is smaller than the sum of its proper divisors (2975011220944).

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

2121220121200 is a wasteful number, since it uses less digits than its factorization.

2121220121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303050321 (or 5303050310 counting only the distinct ones).

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

Adding to 2121220121200 its reverse (21210221212), we get a palindrome (2142430342412).

The spelling of 2121220121200 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred".