1012002221 has 4 divisors (see below), whose sum is σ = 1036685244. Its totient is φ = 987319200.

The previous prime is 1012002191. The next prime is 1012002227. The reversal of 1012002221 is 1222002101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222002101 = 2243 ⋅544807.

It can be written as a sum of positive squares in 2 ways, for example, as 45414121 + 966588100 = 6739^2 + 31090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012002221 - 2⁶ = 1012002157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012002227) 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, 12341450 + ... + 12341531.

It is an arithmetic number, because the mean of its divisors is an integer number (259171311).

Almost surely, 2^1012002221 is an apocalyptic number.

It is an amenable number.

1012002221 is a deficient number, since it is larger than the sum of its proper divisors (24683023).

1012002221 is an equidigital number, since it uses as much as digits as its factorization.

1012002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24683022.

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

The square root of 1012002221 is about 31811.9823494230. The cubic root of 1012002221 is about 1003.9848402895.

Adding to 1012002221 its reverse (1222002101), we get a palindrome (2234004322).

The spelling of 1012002221 in words is "one billion, twelve million, two thousand, two hundred twenty-one".