21100002011 has 32 divisors (see below), whose sum is σ = 23834981376. Its totient is φ = 18514080000.

The previous prime is 21100001929. The next prime is 21100002041. The reversal of 21100002011 is 11020000112.

It is a cyclic number.

It is not a de Polignac number, because 21100002011 - 2¹⁸ = 21099739867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21100002011.

It is not an unprimeable number, because it can be changed into a prime (21100002041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16343276 + ... + 16344566.

It is an arithmetic number, because the mean of its divisors is an integer number (744843168).

Almost surely, 2^21100002011 is an apocalyptic number.

21100002011 is a deficient number, since it is larger than the sum of its proper divisors (2734979365).

21100002011 is a wasteful number, since it uses less digits than its factorization.

21100002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21100002011 its reverse (11020000112), we get a palindrome (32120002123).

The spelling of 21100002011 in words is "twenty-one billion, one hundred million, two thousand, eleven".