200021021001 has 20 divisors (see below), whose sum is σ = 299093087700. Its totient is φ = 133215134976.

The previous prime is 200021020961. The next prime is 200021021047. The reversal of 200021021001 is 100120120002.

It can be written as a sum of positive squares in 2 ways, for example, as 68214992400 + 131806028601 = 261180^2 + 363051^2 .

It is a de Polignac number, because none of the positive numbers 2^k-200021021001 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 (200021022001) 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 19 ways as a sum of consecutive naturals, for example, 1141956 + ... + 1305413.

It is an arithmetic number, because the mean of its divisors is an integer number (14954654385).

Almost surely, 2^200021021001 is an apocalyptic number.

It is an amenable number.

200021021001 is a deficient number, since it is larger than the sum of its proper divisors (99072066699).

200021021001 is a wasteful number, since it uses less digits than its factorization.

200021021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448390 (or 2448381 counting only the distinct ones).

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

Adding to 200021021001 its reverse (100120120002), we get a palindrome (300141141003).

Subtracting from 200021021001 its reverse (100120120002), we obtain a palindrome (99900900999).

The spelling of 200021021001 in words is "two hundred billion, twenty-one million, twenty-one thousand, one".