21001000200201 has 24 divisors (see below), whose sum is σ = 36707630603904. Its totient is φ = 11294655569280.

The previous prime is 21001000200161. The next prime is 21001000200203. The reversal of 21001000200201 is 10200200010012.

It is not a de Polignac number, because 21001000200201 - 2⁷ = 21001000200073 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 (21001000200203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9804387445 + ... + 9804389586.

It is an arithmetic number, because the mean of its divisors is an integer number (1529484608496).

Almost surely, 2^{21001000200201} is an apocalyptic number.

21001000200201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21001000200201 is a deficient number, since it is larger than the sum of its proper divisors (15706630403703).

21001000200201 is a wasteful number, since it uses less digits than its factorization.

21001000200201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19608777061 (or 19608777058 counting only the distinct ones).

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

Adding to 21001000200201 its reverse (10200200010012), we get a palindrome (31201200210213).

The spelling of 21001000200201 in words is "twenty-one trillion, one billion, two hundred thousand, two hundred one".