21010001011 has 2 divisors, whose sum is σ = 21010001012. Its totient is φ = 21010001010.

The previous prime is 21010000967. The next prime is 21010001029. The reversal of 21010001011 is 11010001012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010001011 - 2¹⁷ = 21009869939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010000985 and 21010001003.

It is not a weakly prime, because it can be changed into another prime (21010001041) 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 as a sum of consecutive naturals, namely, 10505000505 + 10505000506.

It is an arithmetic number, because the mean of its divisors is an integer number (10505000506).

Almost surely, 2^21010001011 is an apocalyptic number.

21010001011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010001011 is an equidigital number, since it uses as much as digits as its factorization.

21010001011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21010001011 its reverse (11010001012), we get a palindrome (32020002023).

Subtracting from 21010001011 its reverse (11010001012), we obtain a palindrome (9999999999).

The spelling of 21010001011 in words is "twenty-one billion, ten million, one thousand, eleven".