100100212311221 has 4 divisors (see below), whose sum is σ = 105988460094252. Its totient is φ = 94211964528192.

The previous prime is 100100212311139. The next prime is 100100212311251. The reversal of 100100212311221 is 122113212001001.

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 56790467043025 + 43309745268196 = 7535945^2 + 6581014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100100212311221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 5888247783013 = 100100212311221 / (1 + 0 + 0 + 1 + 0 + 0 + 2 + 1 + 2 + 3 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100100212311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100212311251) 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, 2944123891490 + ... + 2944123891523.

It is an arithmetic number, because the mean of its divisors is an integer number (26497115023563).

Almost surely, 2^{100100212311221} is an apocalyptic number.

It is an amenable number.

100100212311221 is a deficient number, since it is larger than the sum of its proper divisors (5888247783031).

100100212311221 is an equidigital number, since it uses as much as digits as its factorization.

100100212311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888247783030.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 100100212311221 its reverse (122113212001001), we get a palindrome (222213424312222).

The spelling of 100100212311221 in words is "one hundred trillion, one hundred billion, two hundred twelve million, three hundred eleven thousand, two hundred twenty-one".