2100001212121 has 8 divisors (see below), whose sum is σ = 2196038465280. Its totient is φ = 2004358363392.

The previous prime is 2100001212107. The next prime is 2100001212223. The reversal of 2100001212121 is 1212121000012.

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 2100001212121 - 2¹³ = 2100001203929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100001212521) 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, 98590216 + ... + 98611513.

It is an arithmetic number, because the mean of its divisors is an integer number (274504808160).

Almost surely, 2^{2100001212121} is an apocalyptic number.

It is an amenable number.

2100001212121 is a deficient number, since it is larger than the sum of its proper divisors (96037253159).

2100001212121 is a wasteful number, since it uses less digits than its factorization.

2100001212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197202215.

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

Adding to 2100001212121 its reverse (1212121000012), we get a palindrome (3312122212133).

It can be divided in two parts, 21000012 and 12121, that multiplied together give a palindrome (254541145452).

The spelling of 2100001212121 in words is "two trillion, one hundred billion, one million, two hundred twelve thousand, one hundred twenty-one".