1221250123321 has 4 divisors (see below), whose sum is σ = 1244292578532. Its totient is φ = 1198207668112.

The previous prime is 1221250123309. The next prime is 1221250123343. The reversal of 1221250123321 is 1233210521221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 448081633321 + 773168490000 = 669389^2 + 879300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221250123321 - 2⁹ = 1221250122809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221250123381) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11521227526 + ... + 11521227631.

It is an arithmetic number, because the mean of its divisors is an integer number (311073144633).

Almost surely, 2^{1221250123321} is an apocalyptic number.

It is an amenable number.

1221250123321 is a deficient number, since it is larger than the sum of its proper divisors (23042455211).

1221250123321 is an equidigital number, since it uses as much as digits as its factorization.

1221250123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23042455210.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1221250123321 its reverse (1233210521221), we get a palindrome (2454460644542).

The spelling of 1221250123321 in words is "one trillion, two hundred twenty-one billion, two hundred fifty million, one hundred twenty-three thousand, three hundred twenty-one".