200001021221 has 4 divisors (see below), whose sum is σ = 200005018944. Its totient is φ = 199997023500.

The previous prime is 200001021211. The next prime is 200001021251. The reversal of 200001021221 is 122120100002.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122120100002 = 2 ⋅61060050001.

It is a cyclic number.

It is not a de Polignac number, because 200001021221 - 2²² = 199996826917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200001021211) 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, 1922855 + ... + 2024196.

It is an arithmetic number, because the mean of its divisors is an integer number (50001254736).

Almost surely, 2^200001021221 is an apocalyptic number.

It is an amenable number.

200001021221 is a deficient number, since it is larger than the sum of its proper divisors (3997723).

200001021221 is an equidigital number, since it uses as much as digits as its factorization.

200001021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997722.

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

Adding to 200001021221 its reverse (122120100002), we get a palindrome (322121121223).

The spelling of 200001021221 in words is "two hundred billion, one million, twenty-one thousand, two hundred twenty-one".