100211001221 has 4 divisors (see below), whose sum is σ = 100231553772. Its totient is φ = 100190448672.

The previous prime is 100211001179. The next prime is 100211001229. The reversal of 100211001221 is 122100112001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122100112001 = 7 ⋅17442873143.

It can be written as a sum of positive squares in 2 ways, for example, as 74687424100 + 25523577121 = 273290^2 + 159761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100211001221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100211001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10268960 + ... + 10278713.

It is an arithmetic number, because the mean of its divisors is an integer number (25057888443).

Almost surely, 2^100211001221 is an apocalyptic number.

It is an amenable number.

100211001221 is a deficient number, since it is larger than the sum of its proper divisors (20552551).

100211001221 is an equidigital number, since it uses as much as digits as its factorization.

100211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20552550.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100211001221 its reverse (122100112001), we get a palindrome (222311113222).

The spelling of 100211001221 in words is "one hundred billion, two hundred eleven million, one thousand, two hundred twenty-one".