1000212121208 has 8 divisors (see below), whose sum is σ = 1875397727280. Its totient is φ = 500106060600.

The previous prime is 1000212121189. The next prime is 1000212121243. The reversal of 1000212121208 is 8021212120001.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1000212121208² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1000212121208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62513257568 + ... + 62513257583.

It is an arithmetic number, because the mean of its divisors is an integer number (234424715910).

Almost surely, 2^{1000212121208} is an apocalyptic number.

It is an amenable number.

1000212121208 is a deficient number, since it is larger than the sum of its proper divisors (875185606072).

1000212121208 is a wasteful number, since it uses less digits than its factorization.

1000212121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125026515157 (or 125026515153 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 1000212121208 its reverse (8021212120001), we get a palindrome (9021424241209).

The spelling of 1000212121208 in words is "one trillion, two hundred twelve million, one hundred twenty-one thousand, two hundred eight".