20211100210009 has 2 divisors, whose sum is σ = 20211100210010. Its totient is φ = 20211100210008.

The previous prime is 20211100209983. The next prime is 20211100210043. The reversal of 20211100210009 is 90001200111202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20205564403600 + 5535806409 = 4495060^2 + 74403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211100210009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211100210069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105550105004 + 10105550105005.

It is an arithmetic number, because the mean of its divisors is an integer number (10105550105005).

Almost surely, 2^{20211100210009} is an apocalyptic number.

It is an amenable number.

20211100210009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211100210009 is an equidigital number, since it uses as much as digits as its factorization.

20211100210009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 20211100210009 in words is "twenty trillion, two hundred eleven billion, one hundred million, two hundred ten thousand, nine".