2100210000121 has 8 divisors (see below), whose sum is σ = 2224041416424. Its totient is φ = 1976410767360.

The previous prime is 2100210000067. The next prime is 2100210000193. The reversal of 2100210000121 is 1210000120012.

It can be written as a sum of positive squares in 4 ways, for example, as 352526000121 + 1747684000000 = 593739^2 + 1322000^2 .

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 2100210000121 - 2⁹ = 2100209999609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100210000098 and 2100210000107.

It is not an unprimeable number, because it can be changed into a prime (2160210000121) 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, 7911460 + ... + 8172613.

It is an arithmetic number, because the mean of its divisors is an integer number (278005177053).

Almost surely, 2^{2100210000121} is an apocalyptic number.

It is an amenable number.

2100210000121 is a deficient number, since it is larger than the sum of its proper divisors (123831416303).

2100210000121 is a wasteful number, since it uses less digits than its factorization.

2100210000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16091771.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2100210000121 its reverse (1210000120012), we get a palindrome (3310210120133).

The spelling of 2100210000121 in words is "two trillion, one hundred billion, two hundred ten million, one hundred twenty-one", and thus it is an aban number.