1325146021 has 2 divisors, whose sum is σ = 1325146022. Its totient is φ = 1325146020.

The previous prime is 1325146019. The next prime is 1325146061. The reversal of 1325146021 is 1206415231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121513121 + 203632900 = 33489^2 + 14270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1325146021 - 2¹ = 1325146019 is a prime.

Together with 1325146019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1325146061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662573010 + 662573011.

It is an arithmetic number, because the mean of its divisors is an integer number (662573011).

Almost surely, 2^1325146021 is an apocalyptic number.

It is an amenable number.

1325146021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1325146021 is an equidigital number, since it uses as much as digits as its factorization.

1325146021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1325146021 is about 36402.5551438357. Note that the first 3 decimals coincide. The cubic root of 1325146021 is about 1098.3849635486.

The spelling of 1325146021 in words is "one billion, three hundred twenty-five million, one hundred forty-six thousand, twenty-one".