21102011312011 has 4 divisors (see below), whose sum is σ = 24116584356592. Its totient is φ = 18087438267432.

The previous prime is 21102011312009. The next prime is 21102011312029. The reversal of 21102011312011 is 11021311020112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21102011312011 - 2¹ = 21102011312009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102011912011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507286522280 + ... + 1507286522293.

It is an arithmetic number, because the mean of its divisors is an integer number (6029146089148).

Almost surely, 2^{21102011312011} is an apocalyptic number.

21102011312011 is a deficient number, since it is larger than the sum of its proper divisors (3014573044581).

21102011312011 is an equidigital number, since it uses as much as digits as its factorization.

21102011312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014573044580.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21102011312011 its reverse (11021311020112), we get a palindrome (32123322332123).

The spelling of 21102011312011 in words is "twenty-one trillion, one hundred two billion, eleven million, three hundred twelve thousand, eleven".