2211202212221 has 8 divisors (see below), whose sum is σ = 2269367709624. Its totient is φ = 2153645777920.

The previous prime is 2211202212179. The next prime is 2211202212269. The reversal of 2211202212221 is 1222122021122.

It can be written as a sum of positive squares in 4 ways, for example, as 227470809721 + 1983731402500 = 476939^2 + 1408450^2 .

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 2211202212221 - 2⁶ = 2211202212157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211202212193 and 2211202212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211202212721) 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, 152258420 + ... + 152272941.

It is an arithmetic number, because the mean of its divisors is an integer number (283670963703).

Almost surely, 2^{2211202212221} is an apocalyptic number.

It is an amenable number.

2211202212221 is a deficient number, since it is larger than the sum of its proper divisors (58165497403).

2211202212221 is a wasteful number, since it uses less digits than its factorization.

2211202212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304531551.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2211202212221 its reverse (1222122021122), we get a palindrome (3433324233343).

The spelling of 2211202212221 in words is "two trillion, two hundred eleven billion, two hundred two million, two hundred twelve thousand, two hundred twenty-one".