2221020221221 has 8 divisors (see below), whose sum is σ = 2257548353144. Its totient is φ = 2184495894720.

The previous prime is 2221020221213. The next prime is 2221020221267. The reversal of 2221020221221 is 1221220201222.

It can be written as a sum of positive squares in 4 ways, for example, as 20280608100 + 2200739613121 = 142410^2 + 1483489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221020221221 - 2³ = 2221020221213 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 (2221020221921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237655 + ... + 2120971.

It is an arithmetic number, because the mean of its divisors is an integer number (282193544143).

Almost surely, 2^{2221020221221} is an apocalyptic number.

It is an amenable number.

2221020221221 is a deficient number, since it is larger than the sum of its proper divisors (36528131923).

2221020221221 is a wasteful number, since it uses less digits than its factorization.

2221020221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902711.

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

Adding to 2221020221221 its reverse (1221220201222), we get a palindrome (3442240422443).

The spelling of 2221020221221 in words is "two trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".