1345898221 has 2 divisors, whose sum is σ = 1345898222. Its totient is φ = 1345898220.

The previous prime is 1345898189. The next prime is 1345898233. The reversal of 1345898221 is 1228985431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1048852996 + 297045225 = 32386^2 + 17235^2 .

It is an emirp because it is prime and its reverse (1228985431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1345898221 - 2⁵ = 1345898189 is a prime.

It is a super-2 number, since 2×1345898221² = 3622884042581929682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345898321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672949110 + 672949111.

It is an arithmetic number, because the mean of its divisors is an integer number (672949111).

Almost surely, 2^1345898221 is an apocalyptic number.

It is an amenable number.

1345898221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345898221 is an equidigital number, since it uses as much as digits as its factorization.

1345898221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 1345898221 is about 36686.4855362298. The cubic root of 1345898221 is about 1104.0889745403.

The spelling of 1345898221 in words is "one billion, three hundred forty-five million, eight hundred ninety-eight thousand, two hundred twenty-one".