220312021 has 4 divisors (see below), whose sum is σ = 220344192. Its totient is φ = 220279852.

The previous prime is 220312019. The next prime is 220312031. The reversal of 220312021 is 120213022.

220312021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120213022 = 2 ⋅60106511.

It is a cyclic number.

It is not a de Polignac number, because 220312021 - 2¹ = 220312019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220311992 and 220312010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220312031) 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, 1255 + ... + 21028.

It is an arithmetic number, because the mean of its divisors is an integer number (55086048).

Almost surely, 2^220312021 is an apocalyptic number.

It is an amenable number.

220312021 is a deficient number, since it is larger than the sum of its proper divisors (32171).

220312021 is an equidigital number, since it uses as much as digits as its factorization.

220312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32170.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 220312021 is about 14842.9114731578. The cubic root of 220312021 is about 603.9663345782.

Adding to 220312021 its reverse (120213022), we get a palindrome (340525043).

The spelling of 220312021 in words is "two hundred twenty million, three hundred twelve thousand, twenty-one".