2021223121 has 8 divisors (see below), whose sum is σ = 2126361600. Its totient is φ = 1918447440.

The previous prime is 2021223107. The next prime is 2021223131. The reversal of 2021223121 is 1213221202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021223121 - 2⁵ = 2021223089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021223095 and 2021223104.

It is not an unprimeable number, because it can be changed into a prime (2021223131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588945 + ... + 592366.

It is an arithmetic number, because the mean of its divisors is an integer number (265795200).

Almost surely, 2^2021223121 is an apocalyptic number.

It is an amenable number.

2021223121 is a deficient number, since it is larger than the sum of its proper divisors (105138479).

2021223121 is a wasteful number, since it uses less digits than its factorization.

2021223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181399.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2021223121 is about 44958.0150918610. The cubic root of 2021223121 is about 1264.3619545809.

Adding to 2021223121 its reverse (1213221202), we get a palindrome (3234444323).

The spelling of 2021223121 in words is "two billion, twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".