1003213001991 has 16 divisors (see below), whose sum is σ = 1338600941568. Its totient is φ = 668317020000.

The previous prime is 1003213001963. The next prime is 1003213002083. The reversal of 1003213001991 is 1991003123001.

It is a happy number.

It is not a de Polignac number, because 1003213001991 - 2²² = 1003208807687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003213001951) 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 15 ways as a sum of consecutive naturals, for example, 32189266 + ... + 32220416.

It is an arithmetic number, because the mean of its divisors is an integer number (83662558848).

Almost surely, 2^{1003213001991} is an apocalyptic number.

1003213001991 is a deficient number, since it is larger than the sum of its proper divisors (335387939577).

1003213001991 is a wasteful number, since it uses less digits than its factorization.

1003213001991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38702.

The product of its (nonzero) digits is 1458, while the sum is 30.

Adding to 1003213001991 its reverse (1991003123001), we get a palindrome (2994216124992).

The spelling of 1003213001991 in words is "one trillion, three billion, two hundred thirteen million, one thousand, nine hundred ninety-one".