1320421 has 2 divisors, whose sum is σ = 1320422. Its totient is φ = 1320420.

The previous prime is 1320413. The next prime is 1320427. The reversal of 1320421 is 1240231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923521 + 396900 = 961^2 + 630^2 .

It is an emirp because it is prime and its reverse (1240231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320421 - 2³ = 1320413 is a prime.

It is an Ulam number.

1320421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660210 + 660211.

It is an arithmetic number, because the mean of its divisors is an integer number (660211).

2^1320421 is an apocalyptic number.

It is an amenable number.

1320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320421 is an equidigital number, since it uses as much as digits as its factorization.

1320421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1320421 is about 1149.0957314341. The cubic root of 1320421 is about 109.7077919482.

Adding to 1320421 its reverse (1240231), we get a palindrome (2560652).

It can be divided in two parts, 13204 and 21, that added together give a square (13225 = 115²).

The spelling of 1320421 in words is "one million, three hundred twenty thousand, four hundred twenty-one".