1000201022221 has 4 divisors (see below), whose sum is σ = 1000210730112. Its totient is φ = 1000191314332.

The previous prime is 1000201022201. The next prime is 1000201022231. The reversal of 1000201022221 is 1222201020001.

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 1000201022221 - 2⁹ = 1000201021709 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 (1000201022201) 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 3 ways as a sum of consecutive naturals, for example, 4697725 + ... + 4906018.

It is an arithmetic number, because the mean of its divisors is an integer number (250052682528).

Almost surely, 2^{1000201022221} is an apocalyptic number.

It is an amenable number.

1000201022221 is a deficient number, since it is larger than the sum of its proper divisors (9707891).

1000201022221 is an equidigital number, since it uses as much as digits as its factorization.

1000201022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9707890.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1000201022221 its reverse (1222201020001), we get a palindrome (2222402042222).

The spelling of 1000201022221 in words is "one trillion, two hundred one million, twenty-two thousand, two hundred twenty-one".