1001221211 has 8 divisors (see below), whose sum is σ = 1047367584. Its totient is φ = 955292800.

The previous prime is 1001221187. The next prime is 1001221223. The reversal of 1001221211 is 1121221001.

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 1001221211 - 2¹⁸ = 1000959067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221192 and 1001221201.

It is not an unprimeable number, because it can be changed into a prime (1001221231) 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, 45056 + ... + 63501.

It is an arithmetic number, because the mean of its divisors is an integer number (130920948).

Almost surely, 2^1001221211 is an apocalyptic number.

1001221211 is a deficient number, since it is larger than the sum of its proper divisors (46146373).

1001221211 is a wasteful number, since it uses less digits than its factorization.

1001221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108981.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1001221211 is about 31642.0797514955. The cubic root of 1001221211 is about 1000.4069047394.

Adding to 1001221211 its reverse (1121221001), we get a palindrome (2122442212).

The spelling of 1001221211 in words is "one billion, one million, two hundred twenty-one thousand, two hundred eleven".