212000021221 has 8 divisors (see below), whose sum is σ = 221366617920. Its totient is φ = 202645858272.

The previous prime is 212000021179. The next prime is 212000021227. The reversal of 212000021221 is 122120000212.

It is a happy number.

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 212000021221 - 2⁹ = 212000020709 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 (212000021227) 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, 3073576 + ... + 3141793.

It is an arithmetic number, because the mean of its divisors is an integer number (27670827240).

Almost surely, 2^212000021221 is an apocalyptic number.

It is an amenable number.

212000021221 is a deficient number, since it is larger than the sum of its proper divisors (9366596699).

212000021221 is a wasteful number, since it uses less digits than its factorization.

212000021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216875.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 212000021221 its reverse (122120000212), we get a palindrome (334120021433).

The spelling of 212000021221 in words is "two hundred twelve billion, twenty-one thousand, two hundred twenty-one".