1221002001222 has 64 divisors (see below), whose sum is σ = 2499029114880. Its totient is φ = 397600068096.

The previous prime is 1221002001217. The next prime is 1221002001223. The reversal of 1221002001222 is 2221002001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221002001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188743404 + ... + 188749872.

It is an arithmetic number, because the mean of its divisors is an integer number (39047329920).

Almost surely, 2^{1221002001222} is an apocalyptic number.

1221002001222 is an abundant number, since it is smaller than the sum of its proper divisors (1278027113658).

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

1221002001222 is a wasteful number, since it uses less digits than its factorization.

1221002001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10365.

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

Adding to 1221002001222 its reverse (2221002001221), we get a palindrome (3442004002443).

Subtracting 1221002001222 from its reverse (2221002001221), we obtain a palindrome (999999999999).

The spelling of 1221002001222 in words is "one trillion, two hundred twenty-one billion, two million, one thousand, two hundred twenty-two".