100101211001221 has 4 divisors (see below), whose sum is σ = 100226808506412. Its totient is φ = 99975613496032.

The previous prime is 100101211001219. The next prime is 100101211001227. The reversal of 100101211001221 is 122100112101001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33754810192321 + 66346400808900 = 5809889^2 + 8145330^2 .

It is a cyclic number.

It is not a de Polignac number, because 100101211001221 - 2¹ = 100101211001219 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 (100101211001227) 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, 62798751400 + ... + 62798752993.

It is an arithmetic number, because the mean of its divisors is an integer number (25056702126603).

Almost surely, 2^{100101211001221} is an apocalyptic number.

It is an amenable number.

100101211001221 is a deficient number, since it is larger than the sum of its proper divisors (125597505191).

100101211001221 is an equidigital number, since it uses as much as digits as its factorization.

100101211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125597505190.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 100101211001221 its reverse (122100112101001), we get a palindrome (222201323102222).

The spelling of 100101211001221 in words is "one hundred trillion, one hundred one billion, two hundred eleven million, one thousand, two hundred twenty-one".