20210211101009 has 4 divisors (see below), whose sum is σ = 20210311454004. Its totient is φ = 20210110748016.

The previous prime is 20210211100973. The next prime is 20210211101029. The reversal of 20210211101009 is 90010111201202.

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 10742189790784 + 9468021310225 = 3277528^2 + 3077015^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210211101009 - 2⁴⁰ = 19110699473233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210211101029) 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, 49873802 + ... + 50277395.

It is an arithmetic number, because the mean of its divisors is an integer number (5052577863501).

Almost surely, 2^{20210211101009} is an apocalyptic number.

It is an amenable number.

20210211101009 is a deficient number, since it is larger than the sum of its proper divisors (100352995).

20210211101009 is a wasteful number, since it uses less digits than its factorization.

20210211101009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100352994.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 20210211101009 in words is "twenty trillion, two hundred ten billion, two hundred eleven million, one hundred one thousand, nine".