1345753221 has 16 divisors (see below), whose sum is σ = 1808976000. Its totient is φ = 889878528.

The previous prime is 1345753217. The next prime is 1345753259. The reversal of 1345753221 is 1223575431.

It is not a de Polignac number, because 1345753221 - 2² = 1345753217 is a prime.

It is a super-2 number, since 2×1345753221² = 3622103463663749682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345753921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197845 + ... + 204533.

It is an arithmetic number, because the mean of its divisors is an integer number (113061000).

Almost surely, 2^1345753221 is an apocalyptic number.

It is an amenable number.

1345753221 is a deficient number, since it is larger than the sum of its proper divisors (463222779).

1345753221 is a wasteful number, since it uses less digits than its factorization.

1345753221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7228.

The product of its digits is 25200, while the sum is 33.

The square root of 1345753221 is about 36684.5092784407. The cubic root of 1345753221 is about 1104.0493235354.

The spelling of 1345753221 in words is "one billion, three hundred forty-five million, seven hundred fifty-three thousand, two hundred twenty-one".