1220021333 has 4 divisors (see below), whose sum is σ = 1236734028. Its totient is φ = 1203308640.

The previous prime is 1220021323. The next prime is 1220021351. The reversal of 1220021333 is 3331200221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 965842084 + 254179249 = 31078^2 + 15943^2 .

It is not a de Polignac number, because 1220021333 - 2²⁴ = 1203244117 is a prime.

It is a super-3 number, since 3×1220021333³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021323) 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, 8356238 + ... + 8356383.

It is an arithmetic number, because the mean of its divisors is an integer number (309183507).

Almost surely, 2^1220021333 is an apocalyptic number.

It is an amenable number.

1220021333 is a deficient number, since it is larger than the sum of its proper divisors (16712695).

1220021333 is an equidigital number, since it uses as much as digits as its factorization.

1220021333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16712694.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 1220021333 is about 34928.8037728176. The cubic root of 1220021333 is about 1068.5359582396.

Adding to 1220021333 its reverse (3331200221), we get a palindrome (4551221554).

It can be divided in two parts, 12200 and 21333, that added together give a palindrome (33533).

The spelling of 1220021333 in words is "one billion, two hundred twenty million, twenty-one thousand, three hundred thirty-three".