1345023221 has 16 divisors (see below), whose sum is σ = 1450072368. Its totient is φ = 1242931200.

The previous prime is 1345023193. The next prime is 1345023247. The reversal of 1345023221 is 1223205431.

It can be written as a sum of positive squares in 8 ways, for example, as 181872196 + 1163151025 = 13486^2 + 34105^2 .

It is not a de Polignac number, because 1345023221 - 2⁶ = 1345023157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345053221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987581 + ... + 988941.

It is an arithmetic number, because the mean of its divisors is an integer number (90629523).

Almost surely, 2^1345023221 is an apocalyptic number.

It is an amenable number.

1345023221 is a deficient number, since it is larger than the sum of its proper divisors (105049147).

1345023221 is a wasteful number, since it uses less digits than its factorization.

1345023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2392.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1345023221 is about 36674.5582250148. The cubic root of 1345023221 is about 1103.8496579585.

Adding to 1345023221 its reverse (1223205431), we get a palindrome (2568228652).

The spelling of 1345023221 in words is "one billion, three hundred forty-five million, twenty-three thousand, two hundred twenty-one".