1421521 has 2 divisors, whose sum is σ = 1421522. Its totient is φ = 1421520.

The previous prime is 1421501. The next prime is 1421527. The reversal of 1421521 is 1251241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134225 + 287296 = 1065^2 + 536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421495 and 1421504.

It is not a weakly prime, because it can be changed into another prime (1421527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710760 + 710761.

It is an arithmetic number, because the mean of its divisors is an integer number (710761).

2^1421521 is an apocalyptic number.

It is an amenable number.

1421521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421521 is an equidigital number, since it uses as much as digits as its factorization.

1421521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80, while the sum is 16.

The square root of 1421521 is about 1192.2755553982. The cubic root of 1421521 is about 112.4392033645.

Adding to 1421521 its reverse (1251241), we get a palindrome (2672762).

The spelling of 1421521 in words is "one million, four hundred twenty-one thousand, five hundred twenty-one".