1121620321 has 2 divisors, whose sum is σ = 1121620322. Its totient is φ = 1121620320.

The previous prime is 1121620309. The next prime is 1121620349. The reversal of 1121620321 is 1230261211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 874030096 + 247590225 = 29564^2 + 15735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121620321 - 2⁹ = 1121619809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121620351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560810160 + 560810161.

It is an arithmetic number, because the mean of its divisors is an integer number (560810161).

Almost surely, 2^1121620321 is an apocalyptic number.

It is an amenable number.

1121620321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121620321 is an equidigital number, since it uses as much as digits as its factorization.

1121620321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1121620321 is about 33490.6004873009. The cubic root of 1121620321 is about 1038.9993830593. Note that the first 3 decimals are identical.

Adding to 1121620321 its reverse (1230261211), we get a palindrome (2351881532).

The spelling of 1121620321 in words is "one billion, one hundred twenty-one million, six hundred twenty thousand, three hundred twenty-one".