100210212121 has 4 divisors (see below), whose sum is σ = 100729436212. Its totient is φ = 99690988032.

The previous prime is 100210212119. The next prime is 100210212199. The reversal of 100210212121 is 121212012001.

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 72500947600 + 27709264521 = 269260^2 + 166461^2 .

It is a cyclic number.

It is not a de Polignac number, because 100210212121 - 2¹ = 100210212119 is a prime.

It is a super-2 number, since 2×100210212121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100210212821) 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 3 ways as a sum of consecutive naturals, for example, 259611756 + ... + 259612141.

It is an arithmetic number, because the mean of its divisors is an integer number (25182359053).

Almost surely, 2^100210212121 is an apocalyptic number.

It is an amenable number.

100210212121 is a deficient number, since it is larger than the sum of its proper divisors (519224091).

100210212121 is an equidigital number, since it uses as much as digits as its factorization.

100210212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519224090.

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

Adding to 100210212121 its reverse (121212012001), we get a palindrome (221422224122).

The spelling of 100210212121 in words is "one hundred billion, two hundred ten million, two hundred twelve thousand, one hundred twenty-one".