2121200120221 has 16 divisors (see below), whose sum is σ = 2610767472768. Its totient is φ = 1678273848000.

The previous prime is 2121200120173. The next prime is 2121200120227. The reversal of 2121200120221 is 1220210021212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2121200120221 - 2¹³ = 2121200112029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121200120195 and 2121200120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121200120227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4137771 + ... + 4622071.

It is an arithmetic number, because the mean of its divisors is an integer number (163172967048).

Almost surely, 2^{2121200120221} is an apocalyptic number.

It is an amenable number.

2121200120221 is a deficient number, since it is larger than the sum of its proper divisors (489567352547).

2121200120221 is a wasteful number, since it uses less digits than its factorization.

2121200120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532452.

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

Adding to 2121200120221 its reverse (1220210021212), we get a palindrome (3341410141433).

Subtracting from 2121200120221 its reverse (1220210021212), we obtain a palindrome (900990099009).

The spelling of 2121200120221 in words is "two trillion, one hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred twenty-one".