1222216172221 has 24 divisors (see below), whose sum is σ = 1462897749600. Its totient is φ = 1016328852000.

The previous prime is 1222216172213. The next prime is 1222216172251. The reversal of 1222216172221 is 1222716122221.

It is not a de Polignac number, because 1222216172221 - 2³ = 1222216172213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222216172251) 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, 9099355 + ... + 9232696.

It is an arithmetic number, because the mean of its divisors is an integer number (60954072900).

Almost surely, 2^{1222216172221} is an apocalyptic number.

1222216172221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1222216172221 is a deficient number, since it is larger than the sum of its proper divisors (240681577379).

1222216172221 is a wasteful number, since it uses less digits than its factorization.

1222216172221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18332121 (or 18332110 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The spelling of 1222216172221 in words is "one trillion, two hundred twenty-two billion, two hundred sixteen million, one hundred seventy-two thousand, two hundred twenty-one".