100212121021 has 8 divisors (see below), whose sum is σ = 105495526080. Its totient is φ = 94929624288.

The previous prime is 100212121007. The next prime is 100212121057. The reversal of 100212121021 is 120121212001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100212121021 - 2⁹ = 100212120509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100212120992 and 100212121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212121621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5505 + ... + 447721.

It is an arithmetic number, because the mean of its divisors is an integer number (13186940760).

Almost surely, 2^100212121021 is an apocalyptic number.

It is an amenable number.

100212121021 is a deficient number, since it is larger than the sum of its proper divisors (5283405059).

100212121021 is a wasteful number, since it uses less digits than its factorization.

100212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454163.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 100212121021 its reverse (120121212001), we get a palindrome (220333333022).

The spelling of 100212121021 in words is "one hundred billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".