1221021103000 has 32 divisors (see below), whose sum is σ = 2857189383360. Its totient is φ = 488408440800.

The previous prime is 1221021102923. The next prime is 1221021103013. The reversal of 1221021103000 is 3011201221.

It is a congruent 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, 610509552 + ... + 610511551.

It is an arithmetic number, because the mean of its divisors is an integer number (89287168230).

Almost surely, 2^{1221021103000} is an apocalyptic number.

1221021103000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221021103000 is an abundant number, since it is smaller than the sum of its proper divisors (1636168280360).

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

1221021103000 is a wasteful number, since it uses less digits than its factorization.

1221021103000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221021124 (or 1221021110 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1221021103000 its reverse (3011201221), we get a palindrome (1224032304221).

The spelling of 1221021103000 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred three thousand".