2211212212221 has 8 divisors (see below), whose sum is σ = 2949203437920. Its totient is φ = 1473681230672.

The previous prime is 2211212212207. The next prime is 2211212212229. The reversal of 2211212212221 is 1222122121122.

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 2211212212221 - 2⁵ = 2211212212189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211212212229) 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, 115049826 + ... + 115069043.

It is an arithmetic number, because the mean of its divisors is an integer number (368650429740).

Almost surely, 2^{2211212212221} is an apocalyptic number.

It is an amenable number.

2211212212221 is a deficient number, since it is larger than the sum of its proper divisors (737991225699).

2211212212221 is a wasteful number, since it uses less digits than its factorization.

2211212212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230122075.

The product of its digits is 256, while the sum is 21.

Adding to 2211212212221 its reverse (1222122121122), we get a palindrome (3433334333343).

It can be divided in two parts, 221121 and 2212221, that added together give a palindrome (2433342).

The spelling of 2211212212221 in words is "two trillion, two hundred eleven billion, two hundred twelve million, two hundred twelve thousand, two hundred twenty-one".