212100012221 has 8 divisors (see below), whose sum is σ = 214247584224. Its totient is φ = 209953373200.

The previous prime is 212100012197. The next prime is 212100012227. The reversal of 212100012221 is 122210001212.

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 212100012221 - 2²² = 212095817917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100012196 and 212100012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100012227) 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, 228326 + ... + 690168.

It is an arithmetic number, because the mean of its divisors is an integer number (26780948028).

Almost surely, 2^212100012221 is an apocalyptic number.

It is an amenable number.

212100012221 is a deficient number, since it is larger than the sum of its proper divisors (2147572003).

212100012221 is a wasteful number, since it uses less digits than its factorization.

212100012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466491.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 212100012221 its reverse (122210001212), we get a palindrome (334310013433).

The spelling of 212100012221 in words is "two hundred twelve billion, one hundred million, twelve thousand, two hundred twenty-one".