220821265 has 16 divisors (see below), whose sum is σ = 304174080. Its totient is φ = 150753600.

The previous prime is 220821253. The next prime is 220821269. The reversal of 220821265 is 562128022.

220821265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220821265 - 2⁵ = 220821233 is a prime.

It is a super-3 number, since 3×220821265³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (220821269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5761 + ... + 21790.

It is an arithmetic number, because the mean of its divisors is an integer number (19010880).

Almost surely, 2^220821265 is an apocalyptic number.

It is an amenable number.

220821265 is a deficient number, since it is larger than the sum of its proper divisors (83352815).

220821265 is a wasteful number, since it uses less digits than its factorization.

220821265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27792.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 220821265 is about 14860.0560227746. The cubic root of 220821265 is about 604.4313259392.

Adding to 220821265 its reverse (562128022), we get a palindrome (782949287).

The spelling of 220821265 in words is "two hundred twenty million, eight hundred twenty-one thousand, two hundred sixty-five".