1221001220002 has 16 divisors (see below), whose sum is σ = 1859616247680. Its totient is φ = 601136770608.

The previous prime is 1221001219981. The next prime is 1221001220011. The reversal of 1221001220002 is 2000221001221.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586938 + ... + 2227189.

It is an arithmetic number, because the mean of its divisors is an integer number (116226015480).

Almost surely, 2^{1221001220002} is an apocalyptic number.

1221001220002 is a deficient number, since it is larger than the sum of its proper divisors (638615027678).

1221001220002 is a wasteful number, since it uses less digits than its factorization.

1221001220002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3816585.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221001220002 its reverse (2000221001221), we get a palindrome (3221222221223).

The spelling of 1221001220002 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twenty thousand, two".