1012220221 has 4 divisors (see below), whose sum is σ = 1012469500. Its totient is φ = 1011970944.

The previous prime is 1012220191. The next prime is 1012220227. The reversal of 1012220221 is 1220222101.

It is a happy number.

1012220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 245705625 + 766514596 = 15675^2 + 27686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012220221 - 2⁹ = 1012219709 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 (1012220227) 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, 118446 + ... + 126703.

It is an arithmetic number, because the mean of its divisors is an integer number (253117375).

Almost surely, 2^1012220221 is an apocalyptic number.

It is an amenable number.

1012220221 is a deficient number, since it is larger than the sum of its proper divisors (249279).

1012220221 is an equidigital number, since it uses as much as digits as its factorization.

1012220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249278.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1012220221 is about 31815.4085468032. The cubic root of 1012220221 is about 1004.0569260935.

Adding to 1012220221 its reverse (1220222101), we get a palindrome (2232442322).

The spelling of 1012220221 in words is "one billion, twelve million, two hundred twenty thousand, two hundred twenty-one".