1212222000221 has 8 divisors (see below), whose sum is σ = 1256838392064. Its totient is φ = 1167950136960.

The previous prime is 1212222000217. The next prime is 1212222000259. The reversal of 1212222000221 is 1220002222121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1212222000221 - 2² = 1212222000217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212222000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212227000221) 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, 86124980 + ... + 86139053.

It is an arithmetic number, because the mean of its divisors is an integer number (157104799008).

Almost surely, 2^{1212222000221} is an apocalyptic number.

It is an amenable number.

1212222000221 is a deficient number, since it is larger than the sum of its proper divisors (44616391843).

1212222000221 is a wasteful number, since it uses less digits than its factorization.

1212222000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172264291.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1212222000221 its reverse (1220002222121), we get a palindrome (2432224222342).

The spelling of 1212222000221 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, two hundred twenty-one", and thus it is an aban number.