21100200206 has 4 divisors (see below), whose sum is σ = 31650300312. Its totient is φ = 10550100102.

The previous prime is 21100200151. The next prime is 21100200217. The reversal of 21100200206 is 60200200112.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275050050 + ... + 5275050053.

It is an arithmetic number, because the mean of its divisors is an integer number (7912575078).

Almost surely, 2^21100200206 is an apocalyptic number.

21100200206 is a deficient number, since it is larger than the sum of its proper divisors (10550100106).

21100200206 is a wasteful number, since it uses less digits than its factorization.

21100200206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550100105.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21100200206 its reverse (60200200112), we get a palindrome (81300400318).

The spelling of 21100200206 in words is "twenty-one billion, one hundred million, two hundred thousand, two hundred six".