1000020201221 has 4 divisors (see below), whose sum is σ = 1003553841792. Its totient is φ = 996486560652.

The previous prime is 1000020201203. The next prime is 1000020201241. The reversal of 1000020201221 is 1221020200001.

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.

It is a cyclic number.

It is not a de Polignac number, because 1000020201221 - 2³⁴ = 982840332037 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 (1000020201241) 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, 1766819861 + ... + 1766820426.

It is an arithmetic number, because the mean of its divisors is an integer number (250888460448).

Almost surely, 2^{1000020201221} is an apocalyptic number.

It is an amenable number.

1000020201221 is a deficient number, since it is larger than the sum of its proper divisors (3533640571).

1000020201221 is an equidigital number, since it uses as much as digits as its factorization.

1000020201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533640570.

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

Adding to 1000020201221 its reverse (1221020200001), we get a palindrome (2221040401222).

The spelling of 1000020201221 in words is "one trillion, twenty million, two hundred one thousand, two hundred twenty-one".