1221002202222 has 80 divisors (see below), whose sum is σ = 3029219690112. Its totient is φ = 364478233680.

The previous prime is 1221002202151. The next prime is 1221002202227. The reversal of 1221002202222 is 2222022001221.

1221002202222 is a `hidden beast` number, since 1 + 221 + 0 + 0 + 220 + 2 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221002202195 and 1221002202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002202227) 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 39 ways as a sum of consecutive naturals, for example, 4993938 + ... + 5232725.

Almost surely, 2^{1221002202222} is an apocalyptic number.

1221002202222 is an abundant number, since it is smaller than the sum of its proper divisors (1808217487890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221002202222 is a wasteful number, since it uses less digits than its factorization.

1221002202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10226755 (or 10226746 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 1221002202222 its reverse (2222022001221), we get a palindrome (3443024203443).

The spelling of 1221002202222 in words is "one trillion, two hundred twenty-one billion, two million, two hundred two thousand, two hundred twenty-two".