221011212221221 has 8 divisors (see below), whose sum is σ = 221356981766144. Its totient is φ = 220665449046240.

The previous prime is 221011212221183. The next prime is 221011212221249. The reversal of 221011212221221 is 122122212110122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011212221221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011212221192 and 221011212221201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011212222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70396825 + ... + 73469281.

It is an arithmetic number, because the mean of its divisors is an integer number (27669622720768).

Almost surely, 2^{221011212221221} is an apocalyptic number.

It is an amenable number.

221011212221221 is a deficient number, since it is larger than the sum of its proper divisors (345769544923).

221011212221221 is a wasteful number, since it uses less digits than its factorization.

221011212221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184971.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221011212221221 its reverse (122122212110122), we get a palindrome (343133424331343).

It can be divided in two parts, 22101121 and 2221221, that added together give a palindrome (24322342).

The spelling of 221011212221221 in words is "two hundred twenty-one trillion, eleven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".