1002002221 has 8 divisors (see below), whose sum is σ = 1150624800. Its totient is φ = 862968240.

The previous prime is 1002002201. The next prime is 1002002233. The reversal of 1002002221 is 1222002001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1002002221 - 2⁷ = 1002002093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002002198 and 1002002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002002201) 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 7 ways as a sum of consecutive naturals, for example, 2396926 + ... + 2397343.

It is an arithmetic number, because the mean of its divisors is an integer number (143828100).

Almost surely, 2^1002002221 is an apocalyptic number.

1002002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1002002221 is a deficient number, since it is larger than the sum of its proper divisors (148622579).

1002002221 is a wasteful number, since it uses less digits than its factorization.

1002002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4794299.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1002002221 is about 31654.4186646983. The cubic root of 1002002221 is about 1000.6669620627. Note that the first 3 decimals are identical.

Adding to 1002002221 its reverse (1222002001), we get a palindrome (2224004222).

The spelling of 1002002221 in words is "one billion, two million, two thousand, two hundred twenty-one".