2122120022221 has 4 divisors (see below), whose sum is σ = 2122153227292. Its totient is φ = 2122086817152.

The previous prime is 2122120022179. The next prime is 2122120022227. The reversal of 2122120022221 is 1222200212212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1967045520196 + 155074502025 = 1402514^2 + 393795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122120022221 - 2²⁹ = 2121583151309 is a prime.

It is a super-2 number, since 2×2122120022221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122120022227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16506486 + ... + 16634551.

It is an arithmetic number, because the mean of its divisors is an integer number (530538306823).

Almost surely, 2^{2122120022221} is an apocalyptic number.

It is an amenable number.

2122120022221 is a deficient number, since it is larger than the sum of its proper divisors (33205071).

2122120022221 is an equidigital number, since it uses as much as digits as its factorization.

2122120022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33205070.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2122120022221 its reverse (1222200212212), we get a palindrome (3344320234433).

The spelling of 2122120022221 in words is "two trillion, one hundred twenty-two billion, one hundred twenty million, twenty-two thousand, two hundred twenty-one".