1321421 has 2 divisors, whose sum is σ = 1321422. Its totient is φ = 1321420.

The previous prime is 1321417. The next prime is 1321429. The reversal of 1321421 is 1241231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276900 + 44521 = 1130^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321421 - 2² = 1321417 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321396 and 1321405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660710 + 660711.

It is an arithmetic number, because the mean of its divisors is an integer number (660711).

2^1321421 is an apocalyptic number.

It is an amenable number.

1321421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321421 is an equidigital number, since it uses as much as digits as its factorization.

1321421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 14.

The square root of 1321421 is about 1149.5307738377. The cubic root of 1321421 is about 109.7354801145.

Adding to 1321421 its reverse (1241231), we get a palindrome (2562652).

The spelling of 1321421 in words is "one million, three hundred twenty-one thousand, four hundred twenty-one".