100212121222221 has 16 divisors (see below), whose sum is σ = 133808727523328. Its totient is φ = 66711817350000.

The previous prime is 100212121222211. The next prime is 100212121222237. The reversal of 100212121222221 is 122222121212001.

It is not a de Polignac number, because 100212121222221 - 2²⁹ = 100211584351309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212121222211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18186900 + ... + 23047506.

It is an arithmetic number, because the mean of its divisors is an integer number (8363045470208).

Almost surely, 2^{100212121222221} is an apocalyptic number.

It is an amenable number.

100212121222221 is a deficient number, since it is larger than the sum of its proper divisors (33596606301107).

100212121222221 is an equidigital number, since it uses as much as digits as its factorization.

100212121222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4870512.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 100212121222221 its reverse (122222121212001), we get a palindrome (222434242434222).

The spelling of 100212121222221 in words is "one hundred trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".