1005222021 has 8 divisors (see below), whose sum is σ = 1341810624. Its totient is φ = 669390720.

The previous prime is 1005222017. The next prime is 1005222059. The reversal of 1005222021 is 1202225001.

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

It is not a de Polignac number, because 1005222021 - 2² = 1005222017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005222821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186220 + ... + 191541.

It is an arithmetic number, because the mean of its divisors is an integer number (167726328).

Almost surely, 2^1005222021 is an apocalyptic number.

It is an amenable number.

1005222021 is a deficient number, since it is larger than the sum of its proper divisors (336588603).

1005222021 is an equidigital number, since it uses as much as digits as its factorization.

1005222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378651.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1005222021 is about 31705.2364917848. The cubic root of 1005222021 is about 1001.7376524816.

Adding to 1005222021 its reverse (1202225001), we get a palindrome (2207447022).

The spelling of 1005222021 in words is "one billion, five million, two hundred twenty-two thousand, twenty-one".