21010101000011 has 4 divisors (see below), whose sum is σ = 21010164365592. Its totient is φ = 21010037634432.

The previous prime is 21010100999941. The next prime is 21010101000013. The reversal of 21010101000011 is 11000010101012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010101000011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010101000013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31182806 + ... + 31849451.

It is an arithmetic number, because the mean of its divisors is an integer number (5252541091398).

Almost surely, 2^{21010101000011} is an apocalyptic number.

21010101000011 is a deficient number, since it is larger than the sum of its proper divisors (63365581).

21010101000011 is an equidigital number, since it uses as much as digits as its factorization.

21010101000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63365580.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21010101000011 its reverse (11000010101012), we get a palindrome (32010111101023).

The spelling of 21010101000011 in words is "twenty-one trillion, ten billion, one hundred one million, eleven", and thus it is an aban number.