2121021021200 has 120 divisors (see below), whose sum is σ = 5122226745792. Its totient is φ = 844010472960.

The previous prime is 2121021021199. The next prime is 2121021021209. The reversal of 2121021021200 is 21201201212.

It is not an unprimeable number, because it can be changed into a prime (2121021021209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71672807 + ... + 71702393.

Almost surely, 2^{2121021021200} is an apocalyptic number.

2121021021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121021021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2561113372896).

2121021021200 is an abundant number, since it is smaller than the sum of its proper divisors (3001205724592).

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

2121021021200 is a wasteful number, since it uses less digits than its factorization.

2121021021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30529 (or 30518 counting only the distinct ones).

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

Adding to 2121021021200 its reverse (21201201212), we get a palindrome (2142222222412).

The spelling of 2121021021200 in words is "two trillion, one hundred twenty-one billion, twenty-one million, twenty-one thousand, two hundred".