21200101101 has 96 divisors (see below), whose sum is σ = 33321974400. Its totient is φ = 12961589760.

The previous prime is 21200101093. The next prime is 21200101129. The reversal of 21200101101 is 10110100212.

It is a happy number.

It is not a de Polignac number, because 21200101101 - 2³ = 21200101093 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 (21200101151) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 118436230 + ... + 118436408.

It is an arithmetic number, because the mean of its divisors is an integer number (347103900).

Almost surely, 2^21200101101 is an apocalyptic number.

It is an amenable number.

21200101101 is a deficient number, since it is larger than the sum of its proper divisors (12121873299).

21200101101 is a wasteful number, since it uses less digits than its factorization.

21200101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 488 counting only the distinct ones).

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

Adding to 21200101101 its reverse (10110100212), we get a palindrome (31310201313).

The spelling of 21200101101 in words is "twenty-one billion, two hundred million, one hundred one thousand, one hundred one".