2121211102001 has 4 divisors (see below), whose sum is σ = 2232853791600. Its totient is φ = 2009568412404.

The previous prime is 2121211101979. The next prime is 2121211102159. The reversal of 2121211102001 is 1002011121212.

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 not a de Polignac number, because 2121211102001 - 2⁶ = 2121211101937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121211102301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55821344771 + ... + 55821344808.

It is an arithmetic number, because the mean of its divisors is an integer number (558213447900).

Almost surely, 2^{2121211102001} is an apocalyptic number.

It is an amenable number.

2121211102001 is a deficient number, since it is larger than the sum of its proper divisors (111642689599).

2121211102001 is a wasteful number, since it uses less digits than its factorization.

2121211102001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111642689598.

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

Adding to 2121211102001 its reverse (1002011121212), we get a palindrome (3123222223213).

The spelling of 2121211102001 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred two thousand, one".