1001212212121 has 8 divisors (see below), whose sum is σ = 1097775828864. Its totient is φ = 905572649520.

The previous prime is 1001212212097. The next prime is 1001212212167. The reversal of 1001212212121 is 1212122121001.

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

It is not a de Polignac number, because 1001212212121 - 2¹¹ = 1001212210073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001212212095 and 1001212212104.

It is not an unprimeable number, because it can be changed into a prime (1001212272121) 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, 231011265 + ... + 231015598.

It is an arithmetic number, because the mean of its divisors is an integer number (137221978608).

Almost surely, 2^{1001212212121} is an apocalyptic number.

1001212212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001212212121 is a deficient number, since it is larger than the sum of its proper divisors (96563616743).

1001212212121 is a wasteful number, since it uses less digits than its factorization.

1001212212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462027071.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1001212212121 its reverse (1212122121001), we get a palindrome (2213334333122).

The spelling of 1001212212121 in words is "one trillion, one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".