21200110101 has 32 divisors (see below), whose sum is σ = 31640768640. Its totient is φ = 14028854400.

The previous prime is 21200110093. The next prime is 21200110109. The reversal of 21200110101 is 10101100212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21200110093) and next prime (21200110109).

It is not a de Polignac number, because 21200110101 - 2³ = 21200110093 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 (21200110109) 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, 2077231 + ... + 2087411.

It is an arithmetic number, because the mean of its divisors is an integer number (988774020).

Almost surely, 2^21200110101 is an apocalyptic number.

It is an amenable number.

21200110101 is a deficient number, since it is larger than the sum of its proper divisors (10440658539).

21200110101 is a wasteful number, since it uses less digits than its factorization.

21200110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10754 (or 10748 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21200110101 its reverse (10101100212), we get a palindrome (31301210313).

The spelling of 21200110101 in words is "twenty-one billion, two hundred million, one hundred ten thousand, one hundred one".