21012102100011 has 128 divisors (see below), whose sum is σ = 33161899115520. Its totient is φ = 11692158566400.

The previous prime is 21012102100009. The next prime is 21012102100027. The reversal of 21012102100011 is 11000120121012.

It is not a de Polignac number, because 21012102100011 - 2¹ = 21012102100009 is a prime.

It is a super-2 number, since 2×21012102100011² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21012102100011.

It is not an unprimeable number, because it can be changed into a prime (21012102100081) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4889944815 + ... + 4889949111.

It is an arithmetic number, because the mean of its divisors is an integer number (259077336840).

Almost surely, 2^{21012102100011} is an apocalyptic number.

21012102100011 is a deficient number, since it is larger than the sum of its proper divisors (12149797015509).

21012102100011 is a wasteful number, since it uses less digits than its factorization.

21012102100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21012102100011 its reverse (11000120121012), we get a palindrome (32012222221023).

The spelling of 21012102100011 in words is "twenty-one trillion, twelve billion, one hundred two million, one hundred thousand, eleven".