213020230021 has 4 divisors (see below), whose sum is σ = 213081253344. Its totient is φ = 212959206700.

The previous prime is 213020229979. The next prime is 213020230043. The reversal of 213020230021 is 120032020312.

213020230021 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 213020230021 - 2⁹ = 213020229509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213020229977 and 213020230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213020330021) 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, 30506425 + ... + 30513406.

It is an arithmetic number, because the mean of its divisors is an integer number (53270313336).

Almost surely, 2^213020230021 is an apocalyptic number.

It is an amenable number.

213020230021 is a deficient number, since it is larger than the sum of its proper divisors (61023323).

213020230021 is an equidigital number, since it uses as much as digits as its factorization.

213020230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61023322.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 213020230021 its reverse (120032020312), we get a palindrome (333052250333).

The spelling of 213020230021 in words is "two hundred thirteen billion, twenty million, two hundred thirty thousand, twenty-one".