1011233221 has 4 divisors (see below), whose sum is σ = 1020510700. Its totient is φ = 1001955744.

The previous prime is 1011233177. The next prime is 1011233243. The reversal of 1011233221 is 1223321101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223321101 = 31 ⋅39461971.

It can be written as a sum of positive squares in 2 ways, for example, as 240560100 + 770673121 = 15510^2 + 27761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011233221 - 2²¹ = 1009136069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011233195 and 1011233204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011233521) 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, 4638576 + ... + 4638793.

It is an arithmetic number, because the mean of its divisors is an integer number (255127675).

Almost surely, 2^1011233221 is an apocalyptic number.

It is an amenable number.

1011233221 is a deficient number, since it is larger than the sum of its proper divisors (9277479).

1011233221 is an equidigital number, since it uses as much as digits as its factorization.

1011233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9277478.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1011233221 is about 31799.8934117711. The cubic root of 1011233221 is about 1003.7304732643.

Adding to 1011233221 its reverse (1223321101), we get a palindrome (2234554322).

The spelling of 1011233221 in words is "one billion, eleven million, two hundred thirty-three thousand, two hundred twenty-one".