211100011021 has 2 divisors, whose sum is σ = 211100011022. Its totient is φ = 211100011020.

The previous prime is 211100011013. The next prime is 211100011091. The reversal of 211100011021 is 120110001112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108824772996 + 102275238025 = 329886^2 + 319805^2 .

It is a cyclic number.

It is not a de Polignac number, because 211100011021 - 2³ = 211100011013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211100010989 and 211100011007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211100011091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105550005510 + 105550005511.

It is an arithmetic number, because the mean of its divisors is an integer number (105550005511).

Almost surely, 2^211100011021 is an apocalyptic number.

It is an amenable number.

211100011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211100011021 is an equidigital number, since it uses as much as digits as its factorization.

211100011021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 211100011021 its reverse (120110001112), we get a palindrome (331210012133).

Subtracting from 211100011021 its reverse (120110001112), we obtain a palindrome (90990009909).

The spelling of 211100011021 in words is "two hundred eleven billion, one hundred million, eleven thousand, twenty-one".