200001021021 has 16 divisors (see below), whose sum is σ = 296308696320. Its totient is φ = 133329114720.

The previous prime is 200001021007. The next prime is 200001021049. The reversal of 200001021021 is 120120100002.

It is not a de Polignac number, because 200001021021 - 2⁹ = 200001020509 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 200001020994 and 200001021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200001021721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707361 + ... + 948873.

It is an arithmetic number, because the mean of its divisors is an integer number (18519293520).

Almost surely, 2^200001021021 is an apocalyptic number.

It is an amenable number.

200001021021 is a deficient number, since it is larger than the sum of its proper divisors (96307675299).

200001021021 is a wasteful number, since it uses less digits than its factorization.

200001021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272193 (or 272187 counting only the distinct ones).

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

Adding to 200001021021 its reverse (120120100002), we get a palindrome (320121121023).

The spelling of 200001021021 in words is "two hundred billion, one million, twenty-one thousand, twenty-one".