2100011212121 has 8 divisors (see below), whose sum is σ = 2106336861504. Its totient is φ = 2093695069840.

The previous prime is 2100011212111. The next prime is 2100011212181. The reversal of 2100011212121 is 1212121100012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100011212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100011212096 and 2100011212105.

It is not an unprimeable number, because it can be changed into a prime (2100011212111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1934210 + ... + 2818011.

It is an arithmetic number, because the mean of its divisors is an integer number (263292107688).

Almost surely, 2^{2100011212121} is an apocalyptic number.

It is an amenable number.

2100011212121 is a deficient number, since it is larger than the sum of its proper divisors (6325649383).

2100011212121 is an equidigital number, since it uses as much as digits as its factorization.

2100011212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753551.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2100011212121 its reverse (1212121100012), we get a palindrome (3312132312133).

It can be divided in two parts, 2100011 and 212121, that added together give a palindrome (2312132).

The spelling of 2100011212121 in words is "two trillion, one hundred billion, eleven million, two hundred twelve thousand, one hundred twenty-one".