2122212011221 has 4 divisors (see below), whose sum is σ = 2124315294700. Its totient is φ = 2120108727744.

The previous prime is 2122212011147. The next prime is 2122212011267. The reversal of 2122212011221 is 1221102122212.

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 657177742225 + 1465034268996 = 810665^2 + 1210386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122212011221 - 2⁷ = 2122212011093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122212015221) 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, 1051640226 + ... + 1051642243.

It is an arithmetic number, because the mean of its divisors is an integer number (531078823675).

Almost surely, 2^{2122212011221} is an apocalyptic number.

It is an amenable number.

2122212011221 is a deficient number, since it is larger than the sum of its proper divisors (2103283479).

2122212011221 is a wasteful number, since it uses less digits than its factorization.

2122212011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103283478.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2122212011221 its reverse (1221102122212), we get a palindrome (3343314133433).

The spelling of 2122212011221 in words is "two trillion, one hundred twenty-two billion, two hundred twelve million, eleven thousand, two hundred twenty-one".