1002011222221 has 4 divisors (see below), whose sum is σ = 1004242873500. Its totient is φ = 999779570944.

The previous prime is 1002011222213. The next prime is 1002011222227. The reversal of 1002011222221 is 1222221102001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705406813225 + 296604408996 = 839885^2 + 544614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002011222221 - 2³ = 1002011222213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002011222195 and 1002011222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002011222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115824966 + ... + 1115825863.

It is an arithmetic number, because the mean of its divisors is an integer number (251060718375).

Almost surely, 2^{1002011222221} is an apocalyptic number.

It is an amenable number.

1002011222221 is a deficient number, since it is larger than the sum of its proper divisors (2231651279).

1002011222221 is an equidigital number, since it uses as much as digits as its factorization.

1002011222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231651278.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1002011222221 its reverse (1222221102001), we get a palindrome (2224232324222).

The spelling of 1002011222221 in words is "one trillion, two billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".