1001221403 has 12 divisors (see below), whose sum is σ = 1239044688. Its totient is φ = 792174240.

The previous prime is 1001221399. The next prime is 1001221457. The reversal of 1001221403 is 3041221001.

It is not a de Polignac number, because 1001221403 - 2² = 1001221399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001221493) 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 11 ways as a sum of consecutive naturals, for example, 421988 + ... + 424353.

It is an arithmetic number, because the mean of its divisors is an integer number (103253724).

Almost surely, 2^1001221403 is an apocalyptic number.

1001221403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1001221403 is a deficient number, since it is larger than the sum of its proper divisors (237823285).

1001221403 is an equidigital number, since it uses as much as digits as its factorization.

1001221403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846374 (or 846361 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1001221403 is about 31642.0827854299. The cubic root of 1001221403 is about 1000.4069686874.

Adding to 1001221403 its reverse (3041221001), we get a palindrome (4042442404).

The spelling of 1001221403 in words is "one billion, one million, two hundred twenty-one thousand, four hundred three".