1011221203 has 4 divisors (see below), whose sum is σ = 1011284848. Its totient is φ = 1011157560.

The previous prime is 1011221161. The next prime is 1011221207. The reversal of 1011221203 is 3021221101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3021221101 = 43573 ⋅69337.

It is a cyclic number.

It is not a de Polignac number, because 1011221203 - 2¹⁷ = 1011090131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011221207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14125 + ... + 47137.

It is an arithmetic number, because the mean of its divisors is an integer number (252821212).

Almost surely, 2^1011221203 is an apocalyptic number.

1011221203 is a deficient number, since it is larger than the sum of its proper divisors (63645).

1011221203 is an equidigital number, since it uses as much as digits as its factorization.

1011221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63644.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1011221203 is about 31799.7044483121. The cubic root of 1011221203 is about 1003.7264969706.

Adding to 1011221203 its reverse (3021221101), we get a palindrome (4032442304).

The spelling of 1011221203 in words is "one billion, eleven million, two hundred twenty-one thousand, two hundred three".