21200100001 has 4 divisors (see below), whose sum is σ = 21516519472. Its totient is φ = 20883680532.

The previous prime is 21200099993. The next prime is 21200100023. The reversal of 21200100001 is 10000100212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21200100001 - 2³ = 21200099993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200101001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158209635 + ... + 158209768.

It is an arithmetic number, because the mean of its divisors is an integer number (5379129868).

Almost surely, 2^21200100001 is an apocalyptic number.

It is an amenable number.

21200100001 is a deficient number, since it is larger than the sum of its proper divisors (316419471).

21200100001 is an equidigital number, since it uses as much as digits as its factorization.

21200100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316419470.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21200100001 its reverse (10000100212), we get a palindrome (31200200213).

The spelling of 21200100001 in words is "twenty-one billion, two hundred million, one hundred thousand, one".