2121200202121 has 64 divisors (see below), whose sum is σ = 2858191773696. Its totient is φ = 1520310124800.

The previous prime is 2121200202061. The next prime is 2121200202127. The reversal of 2121200202121 is 1212020021212.

It is a happy number.

It is not a de Polignac number, because 2121200202121 - 2¹⁵ = 2121200169353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121200202095 and 2121200202104.

It is not an unprimeable number, because it can be changed into a prime (2121200202127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 809308191 + ... + 809310811.

It is an arithmetic number, because the mean of its divisors is an integer number (44659246464).

Almost surely, 2^{2121200202121} is an apocalyptic number.

It is an amenable number.

2121200202121 is a deficient number, since it is larger than the sum of its proper divisors (736991571575).

2121200202121 is a wasteful number, since it uses less digits than its factorization.

2121200202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5222.

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

Adding to 2121200202121 its reverse (1212020021212), we get a palindrome (3333220223333).

The spelling of 2121200202121 in words is "two trillion, one hundred twenty-one billion, two hundred million, two hundred two thousand, one hundred twenty-one".