21200002101 has 12 divisors (see below), whose sum is σ = 31756382112. Its totient is φ = 14133334572.

The previous prime is 21200002097. The next prime is 21200002151. The reversal of 21200002101 is 10120000212.

It is not a de Polignac number, because 21200002101 - 2² = 21200002097 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200002151) 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, 43621161 + ... + 43621646.

It is an arithmetic number, because the mean of its divisors is an integer number (2646365176).

Almost surely, 2^21200002101 is an apocalyptic number.

It is an amenable number.

21200002101 is a deficient number, since it is larger than the sum of its proper divisors (10556380011).

21200002101 is an frugal number, since it uses more digits than its factorization.

21200002101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87242822 (or 87242810 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21200002101 its reverse (10120000212), we get a palindrome (31320002313).

The spelling of 21200002101 in words is "twenty-one billion, two hundred million, two thousand, one hundred one".