100212221212021 has 4 divisors (see below), whose sum is σ = 100450254992044. Its totient is φ = 99974187432000.

The previous prime is 100212221212007. The next prime is 100212221212087. The reversal of 100212221212021 is 120212122212001.

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 1054141637796 + 99158079574225 = 1026714^2 + 9957815^2 .

It is a cyclic number.

It is not a de Polignac number, because 100212221212021 - 2⁴⁵ = 65027849123189 is a prime.

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 100212221212021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212221215021) 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, 119016889380 + ... + 119016890221.

It is an arithmetic number, because the mean of its divisors is an integer number (25112563748011).

Almost surely, 2^{100212221212021} is an apocalyptic number.

It is an amenable number.

100212221212021 is a deficient number, since it is larger than the sum of its proper divisors (238033780023).

100212221212021 is an equidigital number, since it uses as much as digits as its factorization.

100212221212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238033780022.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 100212221212021 its reverse (120212122212001), we get a palindrome (220424343424022).

The spelling of 100212221212021 in words is "one hundred trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, twenty-one".