1002221022221 has 4 divisors (see below), whose sum is σ = 1002223584444. Its totient is φ = 1002218460000.

The previous prime is 1002221022191. The next prime is 1002221022259. The reversal of 1002221022221 is 1222201222001.

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 331442004100 + 670779018121 = 575710^2 + 819011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002221022221 - 2²² = 1002216827917 is a prime.

It is a Duffinian number.

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 1002221022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002221022281) 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, 558530 + ... + 1521971.

It is an arithmetic number, because the mean of its divisors is an integer number (250555896111).

Almost surely, 2^{1002221022221} is an apocalyptic number.

It is an amenable number.

1002221022221 is a deficient number, since it is larger than the sum of its proper divisors (2562223).

1002221022221 is an equidigital number, since it uses as much as digits as its factorization.

1002221022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562222.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1002221022221 its reverse (1222201222001), we get a palindrome (2224422244222).

The spelling of 1002221022221 in words is "one trillion, two billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".