21120100011 has 12 divisors (see below), whose sum is σ = 30508215192. Its totient is φ = 14079418656.

The previous prime is 21120099997. The next prime is 21120100039. The reversal of 21120100011 is 11000102112.

It is a happy number.

It is not a de Polignac number, because 21120100011 - 2²⁷ = 20985882283 is a prime.

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 = 21120099966 and 21120100002.

It is not an unprimeable number, because it can be changed into a prime (21120100511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232300 + ... + 310166.

It is an arithmetic number, because the mean of its divisors is an integer number (2542351266).

Almost surely, 2^21120100011 is an apocalyptic number.

21120100011 is a deficient number, since it is larger than the sum of its proper divisors (9388115181).

21120100011 is a wasteful number, since it uses less digits than its factorization.

21120100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108010 (or 108007 counting only the distinct ones).

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

Adding to 21120100011 its reverse (11000102112), we get a palindrome (32120202123).

The spelling of 21120100011 in words is "twenty-one billion, one hundred twenty million, one hundred thousand, eleven".