213001222221 has 12 divisors (see below), whose sum is σ = 307674875872. Its totient is φ = 141997840776.

The previous prime is 213001222219. The next prime is 213001222249. The reversal of 213001222221 is 122222100312.

213001222221 is a `hidden beast` number, since 21 + 300 + 122 + 2 + 221 = 666.

It is not a de Polignac number, because 213001222221 - 2¹ = 213001222219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213001222194 and 213001222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213001227221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260670 + ... + 702816.

Almost surely, 2^213001222221 is an apocalyptic number.

It is an amenable number.

213001222221 is a deficient number, since it is larger than the sum of its proper divisors (94673653651).

213001222221 is a wasteful number, since it uses less digits than its factorization.

213001222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495680 (or 495677 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 213001222221 its reverse (122222100312), we get a palindrome (335223322533).

The spelling of 213001222221 in words is "two hundred thirteen billion, one million, two hundred twenty-two thousand, two hundred twenty-one".