1221300321121 has 4 divisors (see below), whose sum is σ = 1222484900544. Its totient is φ = 1220115741700.

The previous prime is 1221300321091. The next prime is 1221300321127. The reversal of 1221300321121 is 1211230031221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221300321121 - 2⁵ = 1221300321089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221300321127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592288165 + ... + 592290226.

It is an arithmetic number, because the mean of its divisors is an integer number (305621225136).

Almost surely, 2^{1221300321121} is an apocalyptic number.

It is an amenable number.

1221300321121 is a deficient number, since it is larger than the sum of its proper divisors (1184579423).

1221300321121 is a wasteful number, since it uses less digits than its factorization.

1221300321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184579422.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1221300321121 its reverse (1211230031221), we get a palindrome (2432530352342).

The spelling of 1221300321121 in words is "one trillion, two hundred twenty-one billion, three hundred million, three hundred twenty-one thousand, one hundred twenty-one".