222120001221 has 8 divisors (see below), whose sum is σ = 296162179104. Its totient is φ = 148078912080.

The previous prime is 222120001217. The next prime is 222120001241. The reversal of 222120001221 is 122100021222.

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

It is not a de Polignac number, because 222120001221 - 2² = 222120001217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222120001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222120001241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657210 + ... + 936036.

It is an arithmetic number, because the mean of its divisors is an integer number (37020272388).

Almost surely, 2^222120001221 is an apocalyptic number.

It is an amenable number.

222120001221 is a deficient number, since it is larger than the sum of its proper divisors (74042177883).

222120001221 is a wasteful number, since it uses less digits than its factorization.

222120001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544371.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 222120001221 its reverse (122100021222), we get a palindrome (344220022443).

The spelling of 222120001221 in words is "two hundred twenty-two billion, one hundred twenty million, one thousand, two hundred twenty-one".