100212221221 has 4 divisors (see below), whose sum is σ = 114528252832. Its totient is φ = 85896189612.

The previous prime is 100212221183. The next prime is 100212221257. The reversal of 100212221221 is 122122212001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122122212001 = 26777 ⋅4560713.

It is a cyclic number.

It is not a de Polignac number, because 100212221221 - 2¹⁹ = 100211696933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100212221195 and 100212221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212221821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7158015795 + ... + 7158015808.

It is an arithmetic number, because the mean of its divisors is an integer number (28632063208).

Almost surely, 2^100212221221 is an apocalyptic number.

It is an amenable number.

100212221221 is a deficient number, since it is larger than the sum of its proper divisors (14316031611).

100212221221 is an equidigital number, since it uses as much as digits as its factorization.

100212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14316031610.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 100212221221 its reverse (122122212001), we get a palindrome (222334433222).

The spelling of 100212221221 in words is "one hundred billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".