2021132213 has 4 divisors (see below), whose sum is σ = 2021295660. Its totient is φ = 2020968768.

The previous prime is 2021132209. The next prime is 2021132219. The reversal of 2021132213 is 3122311202.

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 529782289 + 1491349924 = 23017^2 + 38618^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021132213 - 2² = 2021132209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2021132191 and 2021132200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021132219) 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, 61508 + ... + 88461.

It is an arithmetic number, because the mean of its divisors is an integer number (505323915).

Almost surely, 2^2021132213 is an apocalyptic number.

It is an amenable number.

2021132213 is a deficient number, since it is larger than the sum of its proper divisors (163447).

2021132213 is a wasteful number, since it uses less digits than its factorization.

2021132213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163446.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2021132213 is about 44957.0040483126. The cubic root of 2021132213 is about 1264.3429986760.

Adding to 2021132213 its reverse (3122311202), we get a palindrome (5143443415).

The spelling of 2021132213 in words is "two billion, twenty-one million, one hundred thirty-two thousand, two hundred thirteen".