265221011 has 8 divisors (see below), whose sum is σ = 290065584. Its totient is φ = 240498720.

The previous prime is 265221001. The next prime is 265221017. The reversal of 265221011 is 110122562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 265221011 - 2¹⁰ = 265219987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265221017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26000 + ... + 34733.

It is an arithmetic number, because the mean of its divisors is an integer number (36258198).

Almost surely, 2^265221011 is an apocalyptic number.

265221011 is a deficient number, since it is larger than the sum of its proper divisors (24844573).

265221011 is a wasteful number, since it uses less digits than its factorization.

265221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61141.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 265221011 is about 16285.6074802262. The cubic root of 265221011 is about 642.4943438464.

Adding to 265221011 its reverse (110122562), we get a palindrome (375343573).

The spelling of 265221011 in words is "two hundred sixty-five million, two hundred twenty-one thousand, eleven".