221222112101221 has 32 divisors (see below), whose sum is σ = 292003853414400. Its totient is φ = 162364211225280.

The previous prime is 221222112101203. The next prime is 221222112101231. The reversal of 221222112101221 is 122101211222122.

It is a cyclic number.

It is not a de Polignac number, because 221222112101221 - 2³¹ = 221219964617573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221222112101192 and 221222112101201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222112101231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 436773741 + ... + 437279938.

It is an arithmetic number, because the mean of its divisors is an integer number (9125120419200).

Almost surely, 2^{221222112101221} is an apocalyptic number.

It is an amenable number.

221222112101221 is a deficient number, since it is larger than the sum of its proper divisors (70781741313179).

221222112101221 is a wasteful number, since it uses less digits than its factorization.

221222112101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874053889.

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

Adding to 221222112101221 its reverse (122101211222122), we get a palindrome (343323323323343).

The spelling of 221222112101221 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, one hundred one thousand, two hundred twenty-one".