100222212221 has 4 divisors (see below), whose sum is σ = 100233445500. Its totient is φ = 100210978944.

The previous prime is 100222212191. The next prime is 100222212227. The reversal of 100222212221 is 122212222001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122212222001 = 2671 ⋅45755231.

It can be written as a sum of positive squares in 2 ways, for example, as 58549480900 + 41672731321 = 241970^2 + 204139^2 .

It is a cyclic number.

It is not a de Polignac number, because 100222212221 - 2⁶ = 100222212157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 100222212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100222212227) 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, 5603246 + ... + 5621103.

It is an arithmetic number, because the mean of its divisors is an integer number (25058361375).

Almost surely, 2^100222212221 is an apocalyptic number.

It is an amenable number.

100222212221 is a deficient number, since it is larger than the sum of its proper divisors (11233279).

100222212221 is an equidigital number, since it uses as much as digits as its factorization.

100222212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11233278.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 100222212221 its reverse (122212222001), we get a palindrome (222434434222).

The spelling of 100222212221 in words is "one hundred billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".