21001100011 has 8 divisors (see below), whose sum is σ = 21566476800. Its totient is φ = 20443211880.

The previous prime is 21001099967. The next prime is 21001100017. The reversal of 21001100011 is 11000110012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001100011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001099967 and 21001100003.

It is not an unprimeable number, because it can be changed into a prime (21001100017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1866481 + ... + 1877698.

It is an arithmetic number, because the mean of its divisors is an integer number (2695809600).

Almost surely, 2^21001100011 is an apocalyptic number.

21001100011 is a deficient number, since it is larger than the sum of its proper divisors (565376789).

21001100011 is an equidigital number, since it uses as much as digits as its factorization.

21001100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3744329.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21001100011 its reverse (11000110012), we get a palindrome (32001210023).

The spelling of 21001100011 in words is "twenty-one billion, one million, one hundred thousand, eleven".