222120001021221 has 24 divisors (see below), whose sum is σ = 339866868466944. Its totient is φ = 139306263388800.

The previous prime is 222120001021207. The next prime is 222120001021253. The reversal of 222120001021221 is 122120100021222.

It is a happy number.

222120001021221 is a `hidden beast` number, since 2 + 221 + 200 + 0 + 1 + 0 + 21 + 221 = 666.

It is not a de Polignac number, because 222120001021221 - 2⁶ = 222120001021157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222120001021194 and 222120001021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120001021271) 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 23 ways as a sum of consecutive naturals, for example, 328562355 + ... + 329237696.

It is an arithmetic number, because the mean of its divisors is an integer number (14161119519456).

Almost surely, 2^{222120001021221} is an apocalyptic number.

It is an amenable number.

222120001021221 is a deficient number, since it is larger than the sum of its proper divisors (117746867445723).

222120001021221 is a wasteful number, since it uses less digits than its factorization.

222120001021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657802281 (or 657802278 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 222120001021221 its reverse (122120100021222), we get a palindrome (344240101042443).

Subtracting from 222120001021221 its reverse (122120100021222), we obtain a palindrome (99999900999999).

The spelling of 222120001021221 in words is "two hundred twenty-two trillion, one hundred twenty billion, one million, twenty-one thousand, two hundred twenty-one".