1221331120002 has 48 divisors (see below), whose sum is σ = 3157182493920. Its totient is φ = 348951747816.

The previous prime is 1221331119973. The next prime is 1221331120039. The reversal of 1221331120002 is 2000211331221.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 230785548 + ... + 230790839.

It is an arithmetic number, because the mean of its divisors is an integer number (65774635290).

Almost surely, 2^{1221331120002} is an apocalyptic number.

1221331120002 is an abundant number, since it is smaller than the sum of its proper divisors (1935851373918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221331120002 is a wasteful number, since it uses less digits than its factorization.

1221331120002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461576412 (or 461576399 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221331120002 its reverse (2000211331221), we get a palindrome (3221542451223).

The spelling of 1221331120002 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, one hundred twenty thousand, two".