1001221331 has 8 divisors (see below), whose sum is σ = 1117642944. Its totient is φ = 889033320.

The previous prime is 1001221301. The next prime is 1001221343. The reversal of 1001221331 is 1331221001.

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 1001221331 - 2¹⁴ = 1001204947 is a prime.

It is a super-2 number, since 2×1001221331² = 2004888307298823122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1001221301) 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, 1057901 + ... + 1058846.

It is an arithmetic number, because the mean of its divisors is an integer number (139705368).

Almost surely, 2^1001221331 is an apocalyptic number.

1001221331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1001221331 is a deficient number, since it is larger than the sum of its proper divisors (116421613).

1001221331 is a wasteful number, since it uses less digits than its factorization.

1001221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116801.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1001221331 is about 31642.0816477045. The cubic root of 1001221331 is about 1000.4069447069.

Adding to 1001221331 its reverse (1331221001), we get a palindrome (2332442332).

The spelling of 1001221331 in words is "one billion, one million, two hundred twenty-one thousand, three hundred thirty-one".