1223738742321 has 16 divisors (see below), whose sum is σ = 1813313253120. Its totient is φ = 815660692560.

The previous prime is 1223738742287. The next prime is 1223738742353. The reversal of 1223738742321 is 1232478373221.

1223738742321 is a `hidden beast` number, since 1 + 2 + 2 + 37 + 387 + 4 + 232 + 1 = 666.

It is not a de Polignac number, because 1223738742321 - 2²⁵ = 1223705187889 is a prime.

It is a super-3 number, since 3×1223738742321³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1223738741321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4451170 + ... + 4718091.

It is an arithmetic number, because the mean of its divisors is an integer number (113332078320).

Almost surely, 2^{1223738742321} is an apocalyptic number.

It is an amenable number.

1223738742321 is a deficient number, since it is larger than the sum of its proper divisors (589574510799).

1223738742321 is an equidigital number, since it uses as much as digits as its factorization.

1223738742321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9174213 (or 9174207 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The spelling of 1223738742321 in words is "one trillion, two hundred twenty-three billion, seven hundred thirty-eight million, seven hundred forty-two thousand, three hundred twenty-one".