213321031221 has 8 divisors (see below), whose sum is σ = 291365311104. Its totient is φ = 138745386080.

The previous prime is 213321031207. The next prime is 213321031223. The reversal of 213321031221 is 122130123312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213321031221 - 2⁷ = 213321031093 is a prime.

It is a super-2 number, since 2×213321031221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213321031223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867158541 + ... + 867158786.

It is an arithmetic number, because the mean of its divisors is an integer number (36420663888).

Almost surely, 2^213321031221 is an apocalyptic number.

It is an amenable number.

213321031221 is a deficient number, since it is larger than the sum of its proper divisors (78044279883).

213321031221 is a wasteful number, since it uses less digits than its factorization.

213321031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734317371.

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

Adding to 213321031221 its reverse (122130123312), we get a palindrome (335451154533).

The spelling of 213321031221 in words is "two hundred thirteen billion, three hundred twenty-one million, thirty-one thousand, two hundred twenty-one".