2101121212121 has 4 divisors (see below), whose sum is σ = 2101367628672. Its totient is φ = 2100874795572.

The previous prime is 2101121212103. The next prime is 2101121212133. The reversal of 2101121212121 is 1212121211012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101121212121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101121212121.

It is not an unprimeable number, because it can be changed into a prime (2101121212321) 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, 123195485 + ... + 123212538.

It is an arithmetic number, because the mean of its divisors is an integer number (525341907168).

Almost surely, 2^{2101121212121} is an apocalyptic number.

It is an amenable number.

2101121212121 is a deficient number, since it is larger than the sum of its proper divisors (246416551).

2101121212121 is an equidigital number, since it uses as much as digits as its factorization.

2101121212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246416550.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2101121212121 its reverse (1212121211012), we get a palindrome (3313242423133).

The spelling of 2101121212121 in words is "two trillion, one hundred one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-one".