2122120021221 has 32 divisors (see below), whose sum is σ = 3187313176320. Its totient is φ = 1395206871552.

The previous prime is 2122120021183. The next prime is 2122120021271. The reversal of 2122120021221 is 1221200212212.

It is a happy number.

2122120021221 is a `hidden beast` number, since 2 + 1 + 221 + 200 + 21 + 221 = 666.

It is not a de Polignac number, because 2122120021221 - 2¹⁰ = 2122120020197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2122120021194 and 2122120021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122120021271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18594685 + ... + 18708461.

It is an arithmetic number, because the mean of its divisors is an integer number (99603536760).

Almost surely, 2^{2122120021221} is an apocalyptic number.

It is an amenable number.

2122120021221 is a deficient number, since it is larger than the sum of its proper divisors (1065193155099).

2122120021221 is a wasteful number, since it uses less digits than its factorization.

2122120021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123322 (or 123316 counting only the distinct ones).

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

Adding to 2122120021221 its reverse (1221200212212), we get a palindrome (3343320233433).

It can be divided in two parts, 2 and 122120021221, that multiplied together give a palindrome (244240042442).

The spelling of 2122120021221 in words is "two trillion, one hundred twenty-two billion, one hundred twenty million, twenty-one thousand, two hundred twenty-one".