100221122221 has 4 divisors (see below), whose sum is σ = 109332133344. Its totient is φ = 91110111100.

The previous prime is 100221122219. The next prime is 100221122249. The reversal of 100221122221 is 122221122001.

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: 122221122001 = 11 ⋅11111011091.

It is a cyclic number.

It is not a de Polignac number, because 100221122221 - 2¹ = 100221122219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100221122195 and 100221122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221122291) 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, 4555505545 + ... + 4555505566.

It is an arithmetic number, because the mean of its divisors is an integer number (27333033336).

Almost surely, 2^100221122221 is an apocalyptic number.

100221122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100221122221 is a deficient number, since it is larger than the sum of its proper divisors (9111011123).

100221122221 is an equidigital number, since it uses as much as digits as its factorization.

100221122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9111011122.

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

Adding to 100221122221 its reverse (122221122001), we get a palindrome (222442244222).

The spelling of 100221122221 in words is "one hundred billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".