21791489511 has 32 divisors (see below), whose sum is σ = 32400995328. Its totient is φ = 12914032640.

The previous prime is 21791489501. The next prime is 21791489521. The reversal of 21791489511 is 11598419712.

It is an interprime number because it is at equal distance from previous prime (21791489501) and next prime (21791489521).

It is a cyclic number.

It is not a de Polignac number, because 21791489511 - 2¹¹ = 21791487463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21791489501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1844455 + ... + 1856231.

It is an arithmetic number, because the mean of its divisors is an integer number (1012531104).

Almost surely, 2^21791489511 is an apocalyptic number.

21791489511 is a deficient number, since it is larger than the sum of its proper divisors (10609505817).

21791489511 is a wasteful number, since it uses less digits than its factorization.

21791489511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031.

The product of its digits is 181440, while the sum is 48.

The spelling of 21791489511 in words is "twenty-one billion, seven hundred ninety-one million, four hundred eighty-nine thousand, five hundred eleven".