1345886021 has 2 divisors, whose sum is σ = 1345886022. Its totient is φ = 1345886020.

The previous prime is 1345885997. The next prime is 1345886041. The reversal of 1345886021 is 1206885431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1043613025 + 302272996 = 32305^2 + 17386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345886021 - 2²² = 1341691717 is a prime.

It is a super-2 number, since 2×1345886021² = 3622818363046424882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345886041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672943010 + 672943011.

It is an arithmetic number, because the mean of its divisors is an integer number (672943011).

Almost surely, 2^1345886021 is an apocalyptic number.

It is an amenable number.

1345886021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345886021 is an equidigital number, since it uses as much as digits as its factorization.

1345886021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 1345886021 is about 36686.3192620901. The cubic root of 1345886021 is about 1104.0856384965.

The spelling of 1345886021 in words is "one billion, three hundred forty-five million, eight hundred eighty-six thousand, twenty-one".