211020121001 has 4 divisors (see below), whose sum is σ = 215001632772. Its totient is φ = 207038609232.

The previous prime is 211020120991. The next prime is 211020121003. The reversal of 211020121001 is 100121020112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187964735401 + 23055385600 = 433549^2 + 151840^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020121001 - 2³⁰ = 209946379177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211020121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1990755806 + ... + 1990755911.

It is an arithmetic number, because the mean of its divisors is an integer number (53750408193).

Almost surely, 2^211020121001 is an apocalyptic number.

It is an amenable number.

211020121001 is a deficient number, since it is larger than the sum of its proper divisors (3981511771).

211020121001 is an equidigital number, since it uses as much as digits as its factorization.

211020121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981511770.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211020121001 its reverse (100121020112), we get a palindrome (311141141113).

The spelling of 211020121001 in words is "two hundred eleven billion, twenty million, one hundred twenty-one thousand, one".