21011100011 has 16 divisors (see below), whose sum is σ = 24144806400. Its totient is φ = 18082764000.

The previous prime is 21011099999. The next prime is 21011100017. The reversal of 21011100011 is 11000111012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011100011 - 2⁶ = 21011099947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011100017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263486 + ... + 333836.

It is an arithmetic number, because the mean of its divisors is an integer number (1509050400).

Almost surely, 2^21011100011 is an apocalyptic number.

21011100011 is a deficient number, since it is larger than the sum of its proper divisors (3133706389).

21011100011 is a wasteful number, since it uses less digits than its factorization.

21011100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71810.

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

Adding to 21011100011 its reverse (11000111012), we get a palindrome (32011211023).

The spelling of 21011100011 in words is "twenty-one billion, eleven million, one hundred thousand, eleven".