21101100201 has 12 divisors (see below), whose sum is σ = 30493697520. Its totient is φ = 14060786040.

The previous prime is 21101100193. The next prime is 21101100227. The reversal of 21101100201 is 10200110112.

It is a happy number.

It is not a de Polignac number, because 21101100201 - 2³ = 21101100193 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21101100271) 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 11 ways as a sum of consecutive naturals, for example, 530931 + ... + 569288.

It is an arithmetic number, because the mean of its divisors is an integer number (2541141460).

Almost surely, 2^21101100201 is an apocalyptic number.

It is an amenable number.

21101100201 is a deficient number, since it is larger than the sum of its proper divisors (9392597319).

21101100201 is a wasteful number, since it uses less digits than its factorization.

21101100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102356 (or 1102353 counting only the distinct ones).

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

Adding to 21101100201 its reverse (10200110112), we get a palindrome (31301210313).

The spelling of 21101100201 in words is "twenty-one billion, one hundred one million, one hundred thousand, two hundred one".