1265314221 has 6 divisors (see below), whose sum is σ = 1827676110. Its totient is φ = 843542808.

The previous prime is 1265314187. The next prime is 1265314247. The reversal of 1265314221 is 1224135621.

1265314221 is a `hidden beast` number, since 1 + 2 + 653 + 1 + 4 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 971568900 + 293745321 = 31170^2 + 17139^2 .

It is not a de Polignac number, because 1265314221 - 2⁷ = 1265314093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265314261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70295226 + ... + 70295243.

It is an arithmetic number, because the mean of its divisors is an integer number (304612685).

Almost surely, 2^1265314221 is an apocalyptic number.

It is an amenable number.

1265314221 is a deficient number, since it is larger than the sum of its proper divisors (562361889).

1265314221 is a wasteful number, since it uses less digits than its factorization.

1265314221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140590475 (or 140590472 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1265314221 is about 35571.2555443296. The cubic root of 1265314221 is about 1081.5986330250.

Adding to 1265314221 its reverse (1224135621), we get a palindrome (2489449842).

The spelling of 1265314221 in words is "one billion, two hundred sixty-five million, three hundred fourteen thousand, two hundred twenty-one".