1221100020002 has 16 divisors (see below), whose sum is σ = 1845216847872. Its totient is φ = 606041546880.

The previous prime is 1221100019999. The next prime is 1221100020013. The reversal of 1221100020002 is 2000200011221.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 3275183 + ... + 3628914.

It is an arithmetic number, because the mean of its divisors is an integer number (115326052992).

Almost surely, 2^{1221100020002} is an apocalyptic number.

1221100020002 is a deficient number, since it is larger than the sum of its proper divisors (624116827870).

1221100020002 is a wasteful number, since it uses less digits than its factorization.

1221100020002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6904753.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1221100020002 its reverse (2000200011221), we get a palindrome (3221300031223).

The spelling of 1221100020002 in words is "one trillion, two hundred twenty-one billion, one hundred million, twenty thousand, two".