222212212001221 has 16 divisors (see below), whose sum is σ = 243237870804208. Its totient is φ = 201748585420800.

The previous prime is 222212212001177. The next prime is 222212212001231. The reversal of 222212212001221 is 122100212212222.

It can be written as a sum of positive squares in 8 ways, for example, as 9305855302500 + 212906356698721 = 3050550^2 + 14591311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222212212001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222212212001192 and 222212212001201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222212212001231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15246211 + ... + 26016751.

It is an arithmetic number, because the mean of its divisors is an integer number (15202366925263).

Almost surely, 2^{222212212001221} is an apocalyptic number.

It is an amenable number.

222212212001221 is a deficient number, since it is larger than the sum of its proper divisors (21025658802987).

222212212001221 is a wasteful number, since it uses less digits than its factorization.

222212212001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10796632.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222212212001221 its reverse (122100212212222), we get a palindrome (344312424213443).

It can be divided in two parts, 222212212001 and 221, that added together give a palindrome (222212212222).

The spelling of 222212212001221 in words is "two hundred twenty-two trillion, two hundred twelve billion, two hundred twelve million, one thousand, two hundred twenty-one".