213214243221 has 16 divisors (see below), whose sum is σ = 360997660800. Its totient is φ = 121836710304.

The previous prime is 213214243213. The next prime is 213214243223. The reversal of 213214243221 is 122342412312.

213214243221 is a `hidden beast` number, since 2 + 13 + 2 + 1 + 424 + 3 + 221 = 666.

It is not a de Polignac number, because 213214243221 - 2³ = 213214243213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213214243223) 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, 564058656 + ... + 564059033.

It is an arithmetic number, because the mean of its divisors is an integer number (22562353800).

Almost surely, 2^213214243221 is an apocalyptic number.

213214243221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213214243221 is a deficient number, since it is larger than the sum of its proper divisors (147783417579).

213214243221 is a wasteful number, since it uses less digits than its factorization.

213214243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128117705 (or 1128117699 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 213214243221 its reverse (122342412312), we get a palindrome (335556655533).

The spelling of 213214243221 in words is "two hundred thirteen billion, two hundred fourteen million, two hundred forty-three thousand, two hundred twenty-one".