1221002220002 has 8 divisors (see below), whose sum is σ = 1834471732716. Its totient is φ = 609511642432.

The previous prime is 1221002220001. The next prime is 1221002220029. The reversal of 1221002220002 is 2000222001221.

It can be written as a sum of positive squares in 2 ways, for example, as 765119333521 + 455882886481 = 874711^2 + 675191^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1221002220001) 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 3 ways as a sum of consecutive naturals, for example, 494732243 + ... + 494734710.

Almost surely, 2^{1221002220002} is an apocalyptic number.

1221002220002 is a deficient number, since it is larger than the sum of its proper divisors (613469512714).

1221002220002 is an equidigital number, since it uses as much as digits as its factorization.

1221002220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989467572.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1221002220002 its reverse (2000222001221), we get a palindrome (3221224221223).

The spelling of 1221002220002 in words is "one trillion, two hundred twenty-one billion, two million, two hundred twenty thousand, two".