21000200011 has 32 divisors (see below), whose sum is σ = 25700613120. Its totient is φ = 16749490176.

The previous prime is 21000200009. The next prime is 21000200051. The reversal of 21000200011 is 11000200012.

It is not a de Polignac number, because 21000200011 - 2¹ = 21000200009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21000199967 and 21000200003.

It is not an unprimeable number, because it can be changed into a prime (21000200051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11116155 + ... + 11118043.

It is an arithmetic number, because the mean of its divisors is an integer number (803144160).

Almost surely, 2^21000200011 is an apocalyptic number.

21000200011 is a deficient number, since it is larger than the sum of its proper divisors (4700413109).

21000200011 is a wasteful number, since it uses less digits than its factorization.

21000200011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000200011 its reverse (11000200012), we get a palindrome (32000400023).

Subtracting from 21000200011 its reverse (11000200012), we obtain a palindrome (9999999999).

The spelling of 21000200011 in words is "twenty-one billion, two hundred thousand, eleven".