100000212221 has 16 divisors (see below), whose sum is σ = 125399401344. Its totient is φ = 77628193344.

The previous prime is 100000212181. The next prime is 100000212223. The reversal of 100000212221 is 122212000001.

It is a happy number.

It is not a de Polignac number, because 100000212221 - 2¹⁰ = 100000211197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000212223) 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, 10362191 + ... + 10371836.

It is an arithmetic number, because the mean of its divisors is an integer number (7837462584).

Almost surely, 2^100000212221 is an apocalyptic number.

It is an amenable number.

100000212221 is a deficient number, since it is larger than the sum of its proper divisors (25399189123).

100000212221 is a wasteful number, since it uses less digits than its factorization.

100000212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20734100.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100000212221 its reverse (122212000001), we get a palindrome (222212212222).

The spelling of 100000212221 in words is "one hundred billion, two hundred twelve thousand, two hundred twenty-one".