1320204421 has 2 divisors, whose sum is σ = 1320204422. Its totient is φ = 1320204420.

The previous prime is 1320204397. The next prime is 1320204449. The reversal of 1320204421 is 1244020231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1124596225 + 195608196 = 33535^2 + 13986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320204421 - 2⁷ = 1320204293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320204451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660102210 + 660102211.

It is an arithmetic number, because the mean of its divisors is an integer number (660102211).

Almost surely, 2^1320204421 is an apocalyptic number.

It is an amenable number.

1320204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320204421 is an equidigital number, since it uses as much as digits as its factorization.

1320204421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1320204421 is about 36334.6173916831. The cubic root of 1320204421 is about 1097.0179343131.

Adding to 1320204421 its reverse (1244020231), we get a palindrome (2564224652).

The spelling of 1320204421 in words is "one billion, three hundred twenty million, two hundred four thousand, four hundred twenty-one".