100001212121021 has 16 divisors (see below), whose sum is σ = 109301890199040. Its totient is φ = 91080487395840.

The previous prime is 100001212120993. The next prime is 100001212121059. The reversal of 100001212121021 is 120121212100001.

It is a cyclic number.

It is not a de Polignac number, because 100001212121021 - 2²² = 100001207926717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001212120987 and 100001212121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001212121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19630265 + ... + 24194001.

It is an arithmetic number, because the mean of its divisors is an integer number (6831368137440).

Almost surely, 2^{100001212121021} is an apocalyptic number.

It is an amenable number.

100001212121021 is a deficient number, since it is larger than the sum of its proper divisors (9300678078019).

100001212121021 is a wasteful number, since it uses less digits than its factorization.

100001212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605364.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 100001212121021 its reverse (120121212100001), we get a palindrome (220122424221022).

The spelling of 100001212121021 in words is "one hundred trillion, one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".