1001002222221 has 16 divisors (see below), whose sum is σ = 1372858798080. Its totient is φ = 648402738480.

The previous prime is 1001002222219. The next prime is 1001002222243. The reversal of 1001002222221 is 1222222001001.

It is not a de Polignac number, because 1001002222221 - 2¹ = 1001002222219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001002222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001002222021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20288731 + ... + 20338008.

It is an arithmetic number, because the mean of its divisors is an integer number (85803674880).

Almost surely, 2^{1001002222221} is an apocalyptic number.

It is an amenable number.

1001002222221 is a deficient number, since it is larger than the sum of its proper divisors (371856575859).

1001002222221 is a wasteful number, since it uses less digits than its factorization.

1001002222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40626976.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1001002222221 its reverse (1222222001001), we get a palindrome (2223224223222).

The spelling of 1001002222221 in words is "one trillion, one billion, two million, two hundred twenty-two thousand, two hundred twenty-one".