21524791853 has 16 divisors (see below), whose sum is σ = 21949657344. Its totient is φ = 21105024000.

The previous prime is 21524791837. The next prime is 21524791907. The reversal of 21524791853 is 35819742512.

It is a cyclic number.

It is not a de Polignac number, because 21524791853 - 2⁴ = 21524791837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21524791798 and 21524791807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524794853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5377853 + ... + 5381853.

It is an arithmetic number, because the mean of its divisors is an integer number (1371853584).

Almost surely, 2^21524791853 is an apocalyptic number.

It is an amenable number.

21524791853 is a deficient number, since it is larger than the sum of its proper divisors (424865491).

21524791853 is a wasteful number, since it uses less digits than its factorization.

21524791853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4612.

The product of its digits is 604800, while the sum is 47.

The spelling of 21524791853 in words is "twenty-one billion, five hundred twenty-four million, seven hundred ninety-one thousand, eight hundred fifty-three".