2021132221 has 4 divisors (see below), whose sum is σ = 2049598944. Its totient is φ = 1992665500.

The previous prime is 2021132219. The next prime is 2021132231. The reversal of 2021132221 is 1222311202.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 2021132221 - 2¹ = 2021132219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021132195 and 2021132204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021132231) 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 3 ways as a sum of consecutive naturals, for example, 14233255 + ... + 14233396.

It is an arithmetic number, because the mean of its divisors is an integer number (512399736).

Almost surely, 2^2021132221 is an apocalyptic number.

It is an amenable number.

2021132221 is a deficient number, since it is larger than the sum of its proper divisors (28466723).

2021132221 is an equidigital number, since it uses as much as digits as its factorization.

2021132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28466722.

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

The square root of 2021132221 is about 44957.0041372866. The cubic root of 2021132221 is about 1264.3430003442.

Adding to 2021132221 its reverse (1222311202), we get a palindrome (3243443423).

The spelling of 2021132221 in words is "two billion, twenty-one million, one hundred thirty-two thousand, two hundred twenty-one".