1000001022221 has 16 divisors (see below), whose sum is σ = 1044931829760. Its totient is φ = 955867528560.

The previous prime is 1000001022217. The next prime is 1000001022227. The reversal of 1000001022221 is 1222201000001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1000001022221 - 2² = 1000001022217 is a prime.

It is a super-5 number, since 5×1000001022221⁵ (a number of 61 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000001022227) 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 15 ways as a sum of consecutive naturals, for example, 11997536 + ... + 12080598.

It is an arithmetic number, because the mean of its divisors is an integer number (65308239360).

Almost surely, 2^{1000001022221} is an apocalyptic number.

It is an amenable number.

1000001022221 is a deficient number, since it is larger than the sum of its proper divisors (44930807539).

1000001022221 is an equidigital number, since it uses as much as digits as its factorization.

1000001022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87856.

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

Adding to 1000001022221 its reverse (1222201000001), we get a palindrome (2222202022222).

The spelling of 1000001022221 in words is "one trillion, one million, twenty-two thousand, two hundred twenty-one".