1203121321 has 2 divisors, whose sum is σ = 1203121322. Its totient is φ = 1203121320.

The previous prime is 1203121307. The next prime is 1203121351. The reversal of 1203121321 is 1231213021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151855721 + 51265600 = 33939^2 + 7160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1203121321 - 2¹⁵ = 1203088553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1203121295 and 1203121304.

It is not a weakly prime, because it can be changed into another prime (1203121351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601560660 + 601560661.

It is an arithmetic number, because the mean of its divisors is an integer number (601560661).

Almost surely, 2^1203121321 is an apocalyptic number.

It is an amenable number.

1203121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1203121321 is an equidigital number, since it uses as much as digits as its factorization.

1203121321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1203121321 is about 34686.0392809557. The cubic root of 1203121321 is about 1063.5791321809.

Adding to 1203121321 its reverse (1231213021), we get a palindrome (2434334342).

The spelling of 1203121321 in words is "one billion, two hundred three million, one hundred twenty-one thousand, three hundred twenty-one".