1340550221 has 2 divisors, whose sum is σ = 1340550222. Its totient is φ = 1340550220.

The previous prime is 1340550203. The next prime is 1340550223. The reversal of 1340550221 is 1220550431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340365321 + 184900 = 36611^2 + 430^2 .

It is an emirp because it is prime and its reverse (1220550431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1340550221 - 2¹⁸ = 1340288077 is a prime.

Together with 1340550223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340550223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670275110 + 670275111.

It is an arithmetic number, because the mean of its divisors is an integer number (670275111).

Almost surely, 2^1340550221 is an apocalyptic number.

It is an amenable number.

1340550221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340550221 is an equidigital number, since it uses as much as digits as its factorization.

1340550221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1340550221 is about 36613.5251102649. The cubic root of 1340550221 is about 1102.6246473735.

The spelling of 1340550221 in words is "one billion, three hundred forty million, five hundred fifty thousand, two hundred twenty-one".