1230120321 has 16 divisors (see below), whose sum is σ = 1649243520. Its totient is φ = 815552640.

The previous prime is 1230120319. The next prime is 1230120371. The reversal of 1230120321 is 1230210321.

It is not a de Polignac number, because 1230120321 - 2¹ = 1230120319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1230120321.

It is not an unprimeable number, because it can be changed into a prime (1230120371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452061 + ... + 454773.

It is an arithmetic number, because the mean of its divisors is an integer number (103077720).

Almost surely, 2^1230120321 is an apocalyptic number.

It is an amenable number.

1230120321 is a deficient number, since it is larger than the sum of its proper divisors (419123199).

1230120321 is a wasteful number, since it uses less digits than its factorization.

1230120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1230120321 is about 35073.0711657819. The cubic root of 1230120321 is about 1071.4762053768.

Adding to 1230120321 its reverse (1230210321), we get a palindrome (2460330642).

Subtracting 1230120321 from its reverse (1230210321), we obtain a square (90000 = 300²).

The spelling of 1230120321 in words is "one billion, two hundred thirty million, one hundred twenty thousand, three hundred twenty-one".