213012331221 has 16 divisors (see below), whose sum is σ = 292420035648. Its totient is φ = 137825568000.

The previous prime is 213012331219. The next prime is 213012331223. The reversal of 213012331221 is 122133210312.

It is an interprime number because it is at equal distance from previous prime (213012331219) and next prime (213012331223).

It is not a de Polignac number, because 213012331221 - 2¹ = 213012331219 is a prime.

It is a super-2 number, since 2×213012331221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213012331223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2348295 + ... + 2437316.

It is an arithmetic number, because the mean of its divisors is an integer number (18276252228).

Almost surely, 2^213012331221 is an apocalyptic number.

It is an amenable number.

213012331221 is a deficient number, since it is larger than the sum of its proper divisors (79407704427).

213012331221 is a wasteful number, since it uses less digits than its factorization.

213012331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4786052.

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

Adding to 213012331221 its reverse (122133210312), we get a palindrome (335145541533).

The spelling of 213012331221 in words is "two hundred thirteen billion, twelve million, three hundred thirty-one thousand, two hundred twenty-one".