213021032221 has 4 divisors (see below), whose sum is σ = 213153592032. Its totient is φ = 212888472412.

The previous prime is 213021032173. The next prime is 213021032239. The reversal of 213021032221 is 122230120312.

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 213021032221 - 2⁹ = 213021031709 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 (213021032261) 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, 66277495 + ... + 66280708.

It is an arithmetic number, because the mean of its divisors is an integer number (53288398008).

Almost surely, 2^213021032221 is an apocalyptic number.

It is an amenable number.

213021032221 is a deficient number, since it is larger than the sum of its proper divisors (132559811).

213021032221 is a wasteful number, since it uses less digits than its factorization.

213021032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132559810.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213021032221 its reverse (122230120312), we get a palindrome (335251152533).

The spelling of 213021032221 in words is "two hundred thirteen billion, twenty-one million, thirty-two thousand, two hundred twenty-one".