2121122200221 has 24 divisors (see below), whose sum is σ = 3149904261504. Its totient is φ = 1374440024160.

The previous prime is 2121122200199. The next prime is 2121122200229. The reversal of 2121122200221 is 1220022211212.

It is a happy number.

2121122200221 is a `hidden beast` number, since 2 + 121 + 122 + 200 + 221 = 666.

It is not a de Polignac number, because 2121122200221 - 2²⁹ = 2120585329309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121122200194 and 2121122200203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122200229) 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, 2971545 + ... + 3615566.

It is an arithmetic number, because the mean of its divisors is an integer number (131246010896).

Almost surely, 2^{2121122200221} is an apocalyptic number.

It is an amenable number.

2121122200221 is a deficient number, since it is larger than the sum of its proper divisors (1028782061283).

2121122200221 is a wasteful number, since it uses less digits than its factorization.

2121122200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6588121 (or 6588118 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2121122200221 its reverse (1220022211212), we get a palindrome (3341144411433).

The spelling of 2121122200221 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred thousand, two hundred twenty-one".