1321332421 has 2 divisors, whose sum is σ = 1321332422. Its totient is φ = 1321332420.

The previous prime is 1321332413. The next prime is 1321332427. The reversal of 1321332421 is 1242331231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840188196 + 481144225 = 28986^2 + 21935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321332421 - 2³ = 1321332413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321332392 and 1321332401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321332427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660666210 + 660666211.

It is an arithmetic number, because the mean of its divisors is an integer number (660666211).

Almost surely, 2^1321332421 is an apocalyptic number.

It is an amenable number.

1321332421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321332421 is an equidigital number, since it uses as much as digits as its factorization.

1321332421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 1321332421 is about 36350.1364646682. The cubic root of 1321332421 is about 1097.3302808836.

Adding to 1321332421 its reverse (1242331231), we get a palindrome (2563663652).

The spelling of 1321332421 in words is "one billion, three hundred twenty-one million, three hundred thirty-two thousand, four hundred twenty-one".