21200020101 has 48 divisors (see below), whose sum is σ = 33834178560. Its totient is φ = 12708368640.

The previous prime is 21200020067. The next prime is 21200020109. The reversal of 21200020101 is 10102000212.

It is not a de Polignac number, because 21200020101 - 2¹⁰ = 21200019077 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 (21200020109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3484380 + ... + 3490458.

It is an arithmetic number, because the mean of its divisors is an integer number (704878720).

Almost surely, 2^21200020101 is an apocalyptic number.

It is an amenable number.

21200020101 is a deficient number, since it is larger than the sum of its proper divisors (12634158459).

21200020101 is a wasteful number, since it uses less digits than its factorization.

21200020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6866 (or 6863 counting only the distinct ones).

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

Adding to 21200020101 its reverse (10102000212), we get a palindrome (31302020313).

The spelling of 21200020101 in words is "twenty-one billion, two hundred million, twenty thousand, one hundred one".