21101200011 has 24 divisors (see below), whose sum is σ = 31385203200. Its totient is φ = 13651445376.

The previous prime is 21101200007. The next prime is 21101200033. The reversal of 21101200011 is 11000210112.

It is a happy number.

It is not a de Polignac number, because 21101200011 - 2² = 21101200007 is a prime.

It is a super-5 number, since 5×21101200011⁵ (a number of 53 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21101199966 and 21101200002.

It is not an unprimeable number, because it can be changed into a prime (21101200051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44815 + ... + 210263.

It is an arithmetic number, because the mean of its divisors is an integer number (1307716800).

Almost surely, 2^21101200011 is an apocalyptic number.

21101200011 is a deficient number, since it is larger than the sum of its proper divisors (10284003189).

21101200011 is a wasteful number, since it uses less digits than its factorization.

21101200011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165875 (or 165872 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21101200011 its reverse (11000210112), we get a palindrome (32101410123).

The spelling of 21101200011 in words is "twenty-one billion, one hundred one million, two hundred thousand, eleven".