213143232021 has 4 divisors (see below), whose sum is σ = 284190976032. Its totient is φ = 142095488012.

The previous prime is 213143232019. The next prime is 213143232047. The reversal of 213143232021 is 120232341312.

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 213143232021 - 2¹ = 213143232019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213143231982 and 213143232000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213143232121) 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, 35523872001 + ... + 35523872006.

It is an arithmetic number, because the mean of its divisors is an integer number (71047744008).

Almost surely, 2^213143232021 is an apocalyptic number.

It is an amenable number.

213143232021 is a deficient number, since it is larger than the sum of its proper divisors (71047744011).

213143232021 is an equidigital number, since it uses as much as digits as its factorization.

213143232021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71047744010.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 213143232021 its reverse (120232341312), we get a palindrome (333375573333).

The spelling of 213143232021 in words is "two hundred thirteen billion, one hundred forty-three million, two hundred thirty-two thousand, twenty-one".