1221002022002 has 32 divisors (see below), whose sum is σ = 2144849220864. Its totient is φ = 510368601600.

The previous prime is 1221002021977. The next prime is 1221002022049. The reversal of 1221002022002 is 2002202001221.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 15 ways as a sum of consecutive naturals, for example, 1580627 + ... + 2222697.

It is an arithmetic number, because the mean of its divisors is an integer number (67026538152).

Almost surely, 2^{1221002022002} is an apocalyptic number.

1221002022002 is a deficient number, since it is larger than the sum of its proper divisors (923847198862).

1221002022002 is a wasteful number, since it uses less digits than its factorization.

1221002022002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645434.

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

Adding to 1221002022002 its reverse (2002202001221), we get a palindrome (3223204023223).

The spelling of 1221002022002 in words is "one trillion, two hundred twenty-one billion, two million, twenty-two thousand, two".