1002012221 has 24 divisors (see below), whose sum is σ = 1185563520. Its totient is φ = 844264512.

The previous prime is 1002012211. The next prime is 1002012229. The reversal of 1002012221 is 1222102001.

It is a happy number.

It is not a de Polignac number, because 1002012221 - 2²² = 997817917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002012229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1211210 + ... + 1212036.

It is an arithmetic number, because the mean of its divisors is an integer number (49398480).

Almost surely, 2^1002012221 is an apocalyptic number.

It is an amenable number.

1002012221 is a deficient number, since it is larger than the sum of its proper divisors (183551299).

1002012221 is an equidigital number, since it uses as much as digits as its factorization.

1002012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1226 counting only the distinct ones).

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

The square root of 1002012221 is about 31654.5766201350. The cubic root of 1002012221 is about 1000.6702909430.

Adding to 1002012221 its reverse (1222102001), we get a palindrome (2224114222).

The spelling of 1002012221 in words is "one billion, two million, twelve thousand, two hundred twenty-one".