1221002102222 has 32 divisors (see below), whose sum is σ = 2204114880000. Its totient is φ = 495564581088.

The previous prime is 1221002102219. The next prime is 1221002102269. The reversal of 1221002102222 is 2222012001221.

It is a happy number.

It is a super-2 number, since 2×1221002102222² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221002102222.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 103658 + ... + 1566125.

It is an arithmetic number, because the mean of its divisors is an integer number (68878590000).

Almost surely, 2^{1221002102222} is an apocalyptic number.

1221002102222 is a deficient number, since it is larger than the sum of its proper divisors (983112777778).

1221002102222 is a wasteful number, since it uses less digits than its factorization.

1221002102222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672560.

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

Adding to 1221002102222 its reverse (2222012001221), we get a palindrome (3443014103443).

The spelling of 1221002102222 in words is "one trillion, two hundred twenty-one billion, two million, one hundred two thousand, two hundred twenty-two".