21100101021011 has 4 divisors (see below), whose sum is σ = 21101184041112. Its totient is φ = 21099018000912.

The previous prime is 21100101020993. The next prime is 21100101021067. The reversal of 21100101021011 is 11012010100112.

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 21100101021011 - 2²² = 21100096826707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100101020983 and 21100101021001.

It is not an unprimeable number, because it can be changed into a prime (21100101023011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541480826 + ... + 541519791.

It is an arithmetic number, because the mean of its divisors is an integer number (5275296010278).

Almost surely, 2^{21100101021011} is an apocalyptic number.

21100101021011 is a deficient number, since it is larger than the sum of its proper divisors (1083020101).

21100101021011 is a wasteful number, since it uses less digits than its factorization.

21100101021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083020100.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21100101021011 its reverse (11012010100112), we get a palindrome (32112111121123).

The spelling of 21100101021011 in words is "twenty-one trillion, one hundred billion, one hundred one million, twenty-one thousand, eleven".