21504642311 has 8 divisors (see below), whose sum is σ = 22032301200. Its totient is φ = 20977133760.

The previous prime is 21504642283. The next prime is 21504642331. The reversal of 21504642311 is 11324640512.

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 21504642311 - 2³⁰ = 20430900487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504642331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285680 + ... + 353018.

It is an arithmetic number, because the mean of its divisors is an integer number (2754037650).

Almost surely, 2^21504642311 is an apocalyptic number.

21504642311 is a deficient number, since it is larger than the sum of its proper divisors (527658889).

21504642311 is an equidigital number, since it uses as much as digits as its factorization.

21504642311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75169.

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 21504642311 in words is "twenty-one billion, five hundred four million, six hundred forty-two thousand, three hundred eleven".