2221112122221 has 8 divisors (see below), whose sum is σ = 2961503737920. Its totient is φ = 1480730960672.

The previous prime is 2221112122213. The next prime is 2221112122241. The reversal of 2221112122221 is 1222212111222.

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 2221112122221 - 2³ = 2221112122213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221112122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2103576 + ... + 2977793.

It is an arithmetic number, because the mean of its divisors is an integer number (370187967240).

Almost surely, 2^{2221112122221} is an apocalyptic number.

It is an amenable number.

2221112122221 is a deficient number, since it is larger than the sum of its proper divisors (740391615699).

2221112122221 is a wasteful number, since it uses less digits than its factorization.

2221112122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5227075.

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

Adding to 2221112122221 its reverse (1222212111222), we get a palindrome (3443324233443).

The spelling of 2221112122221 in words is "two trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".