263140221 has 4 divisors (see below), whose sum is σ = 350853632. Its totient is φ = 175426812.

The previous prime is 263140219. The next prime is 263140247. The reversal of 263140221 is 122041362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 263140221 - 2¹ = 263140219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263140201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43856701 + ... + 43856706.

It is an arithmetic number, because the mean of its divisors is an integer number (87713408).

Almost surely, 2^263140221 is an apocalyptic number.

It is an amenable number.

263140221 is a deficient number, since it is larger than the sum of its proper divisors (87713411).

263140221 is an equidigital number, since it uses as much as digits as its factorization.

263140221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87713410.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 263140221 is about 16221.5973627753. The cubic root of 263140221 is about 640.8097018914.

Adding to 263140221 its reverse (122041362), we get a palindrome (385181583).

The spelling of 263140221 in words is "two hundred sixty-three million, one hundred forty thousand, two hundred twenty-one".