1001111000221 has 4 divisors (see below), whose sum is σ = 1044637565472. Its totient is φ = 957584434972.

The previous prime is 1001111000203. The next prime is 1001111000261. The reversal of 1001111000221 is 1220001111001.

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 1001111000221 - 2²⁷ = 1000976782493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001111000198 and 1001111000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111000261) 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, 21763282591 + ... + 21763282636.

It is an arithmetic number, because the mean of its divisors is an integer number (261159391368).

Almost surely, 2^{1001111000221} is an apocalyptic number.

It is an amenable number.

1001111000221 is a deficient number, since it is larger than the sum of its proper divisors (43526565251).

1001111000221 is an equidigital number, since it uses as much as digits as its factorization.

1001111000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43526565250.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001111000221 its reverse (1220001111001), we get a palindrome (2221112111222).

The spelling of 1001111000221 in words is "one trillion, one billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.