21001120101011 has 2 divisors, whose sum is σ = 21001120101012. Its totient is φ = 21001120101010.

The previous prime is 21001120101007. The next prime is 21001120101023. The reversal of 21001120101011 is 11010102110012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001120101011 - 2² = 21001120101007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001120100983 and 21001120101001.

It is not a weakly prime, because it can be changed into another prime (21001120101811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500560050505 + 10500560050506.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560050506).

Almost surely, 2^{21001120101011} is an apocalyptic number.

21001120101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120101011 is an equidigital number, since it uses as much as digits as its factorization.

21001120101011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21001120101011 its reverse (11010102110012), we get a palindrome (32011222211023).

The spelling of 21001120101011 in words is "twenty-one trillion, one billion, one hundred twenty million, one hundred one thousand, eleven".