1221021002002 has 8 divisors (see below), whose sum is σ = 1842498758016. Its totient is φ = 606854749332.

The previous prime is 1221021001933. The next prime is 1221021002017. The reversal of 1221021002002 is 2002001201221.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 1827875418 + ... + 1827876085.

It is an arithmetic number, because the mean of its divisors is an integer number (230312344752).

Almost surely, 2^{1221021002002} is an apocalyptic number.

1221021002002 is a deficient number, since it is larger than the sum of its proper divisors (621477756014).

1221021002002 is a wasteful number, since it uses less digits than its factorization.

1221021002002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655751672.

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

Adding to 1221021002002 its reverse (2002001201221), we get a palindrome (3223022203223).

The spelling of 1221021002002 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two thousand, two".