213331021021 has 4 divisors (see below), whose sum is σ = 213389777344. Its totient is φ = 213272264700.

The previous prime is 213331020989. The next prime is 213331021039. The reversal of 213331021021 is 120120133312.

213331021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213331021021 - 2⁵ = 213331020989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213331021021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213331021061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29372715 + ... + 29379976.

It is an arithmetic number, because the mean of its divisors is an integer number (53347444336).

Almost surely, 2^213331021021 is an apocalyptic number.

It is an amenable number.

213331021021 is a deficient number, since it is larger than the sum of its proper divisors (58756323).

213331021021 is an equidigital number, since it uses as much as digits as its factorization.

213331021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58756322.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 213331021021 its reverse (120120133312), we get a palindrome (333451154333).

The spelling of 213331021021 in words is "two hundred thirteen billion, three hundred thirty-one million, twenty-one thousand, twenty-one".