220512021 has 12 divisors (see below), whose sum is σ = 303810336. Its totient is φ = 142263960.

The previous prime is 220511999. The next prime is 220512029. The reversal of 220512021 is 120215022.

It is not a de Polignac number, because 220512021 - 2¹⁵ = 220479253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220512029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35361 + ... + 41126.

It is an arithmetic number, because the mean of its divisors is an integer number (25317528).

Almost surely, 2^220512021 is an apocalyptic number.

It is an amenable number.

220512021 is a deficient number, since it is larger than the sum of its proper divisors (83298315).

220512021 is an equidigital number, since it uses as much as digits as its factorization.

220512021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76552 (or 76521 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 220512021 is about 14849.6471675256. The cubic root of 220512021 is about 604.1490401981.

Adding to 220512021 its reverse (120215022), we get a palindrome (340727043).

The spelling of 220512021 in words is "two hundred twenty million, five hundred twelve thousand, twenty-one".