1305254221 has 2 divisors, whose sum is σ = 1305254222. Its totient is φ = 1305254220.

The previous prime is 1305254219. The next prime is 1305254231. The reversal of 1305254221 is 1224525031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 853224100 + 452030121 = 29210^2 + 21261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305254221 - 2¹ = 1305254219 is a prime.

Together with 1305254219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305254201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652627110 + 652627111.

It is an arithmetic number, because the mean of its divisors is an integer number (652627111).

Almost surely, 2^1305254221 is an apocalyptic number.

It is an amenable number.

1305254221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305254221 is an equidigital number, since it uses as much as digits as its factorization.

1305254221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1305254221 is about 36128.3022158529. The cubic root of 1305254221 is about 1092.8612705198.

Adding to 1305254221 its reverse (1224525031), we get a palindrome (2529779252).

The spelling of 1305254221 in words is "one billion, three hundred five million, two hundred fifty-four thousand, two hundred twenty-one".