21100001011 has 16 divisors (see below), whose sum is σ = 22768855200. Its totient is φ = 19487692800.

The previous prime is 21100000991. The next prime is 21100001033. The reversal of 21100001011 is 11010000112.

It is a cyclic number.

It is not a de Polignac number, because 21100001011 - 2⁵ = 21100000979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100000985 and 21100001003.

It is not an unprimeable number, because it can be changed into a prime (21100001051) 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, 1144555 + ... + 1162843.

It is an arithmetic number, because the mean of its divisors is an integer number (1423053450).

Almost surely, 2^21100001011 is an apocalyptic number.

21100001011 is a deficient number, since it is larger than the sum of its proper divisors (1668854189).

21100001011 is a wasteful number, since it uses less digits than its factorization.

21100001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19830.

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

Adding to 21100001011 its reverse (11010000112), we get a palindrome (32110001123).

The spelling of 21100001011 in words is "twenty-one billion, one hundred million, one thousand, eleven".