213332121021 has 4 divisors (see below), whose sum is σ = 284442828032. Its totient is φ = 142221414012.

The previous prime is 213332121017. The next prime is 213332121029. The reversal of 213332121021 is 120121233312.

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 not a de Polignac number, because 213332121021 - 2² = 213332121017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213332121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35555353501 + ... + 35555353506.

It is an arithmetic number, because the mean of its divisors is an integer number (71110707008).

Almost surely, 2^213332121021 is an apocalyptic number.

It is an amenable number.

213332121021 is a deficient number, since it is larger than the sum of its proper divisors (71110707011).

213332121021 is an equidigital number, since it uses as much as digits as its factorization.

213332121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71110707010.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 213332121021 its reverse (120121233312), we get a palindrome (333453354333).

The spelling of 213332121021 in words is "two hundred thirteen billion, three hundred thirty-two million, one hundred twenty-one thousand, twenty-one".