1001222021 has 8 divisors (see below), whose sum is σ = 1063868544. Its totient is φ = 938992320.

The previous prime is 1001222017. The next prime is 1001222023. The reversal of 1001222021 is 1202221001.

It is a happy number.

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 1001222021 - 2² = 1001222017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221993 and 1001222011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99245 + ... + 108866.

It is an arithmetic number, because the mean of its divisors is an integer number (132983568).

Almost surely, 2^1001222021 is an apocalyptic number.

It is an amenable number.

1001222021 is a deficient number, since it is larger than the sum of its proper divisors (62646523).

1001222021 is a wasteful number, since it uses less digits than its factorization.

1001222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208411.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1001222021 is about 31642.0925509044. The cubic root of 1001222021 is about 1000.4071745197.

Adding to 1001222021 its reverse (1202221001), we get a palindrome (2203443022).

The spelling of 1001222021 in words is "one billion, one million, two hundred twenty-two thousand, twenty-one".