200201021021 has 4 divisors (see below), whose sum is σ = 200209340892. Its totient is φ = 200192701152.

The previous prime is 200201020973. The next prime is 200201021029. The reversal of 200201021021 is 120120102002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120120102002 = 2 ⋅60060051001.

It can be written as a sum of positive squares in 2 ways, for example, as 46861425625 + 153339595396 = 216475^2 + 391586^2 .

It is a cyclic number.

It is not a de Polignac number, because 200201021021 - 2³⁴ = 183021151837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200201020993 and 200201021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200201021029) 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, 4123736 + ... + 4172001.

It is an arithmetic number, because the mean of its divisors is an integer number (50052335223).

Almost surely, 2^200201021021 is an apocalyptic number.

It is an amenable number.

200201021021 is a deficient number, since it is larger than the sum of its proper divisors (8319871).

200201021021 is an equidigital number, since it uses as much as digits as its factorization.

200201021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319870.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 200201021021 its reverse (120120102002), we get a palindrome (320321123023).

The spelling of 200201021021 in words is "two hundred billion, two hundred one million, twenty-one thousand, twenty-one".