1011221005 has 8 divisors (see below), whose sum is σ = 1215900000. Its totient is φ = 807353616.

The previous prime is 1011220997. The next prime is 1011221011. The reversal of 1011221005 is 5001221101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011221005 - 2³ = 1011220997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200155 + ... + 205144.

It is an arithmetic number, because the mean of its divisors is an integer number (151987500).

Almost surely, 2^1011221005 is an apocalyptic number.

It is an amenable number.

1011221005 is a deficient number, since it is larger than the sum of its proper divisors (204678995).

1011221005 is an equidigital number, since it uses as much as digits as its factorization.

1011221005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405803.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1011221005 is about 31799.7013350755. The cubic root of 1011221005 is about 1003.7264314598.

Adding to 1011221005 its reverse (5001221101), we get a palindrome (6012442106).

The spelling of 1011221005 in words is "one billion, eleven million, two hundred twenty-one thousand, five".