21524241823 has 16 divisors (see below), whose sum is σ = 25710382080. Its totient is φ = 17618521536.

The previous prime is 21524241821. The next prime is 21524241829. The reversal of 21524241823 is 32814242512.

It is not a de Polignac number, because 21524241823 - 2¹ = 21524241821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524241821) 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, 9003 + ... + 207676.

It is an arithmetic number, because the mean of its divisors is an integer number (1606898880).

Almost surely, 2^21524241823 is an apocalyptic number.

21524241823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21524241823 is a deficient number, since it is larger than the sum of its proper divisors (4186140257).

21524241823 is a wasteful number, since it uses less digits than its factorization.

21524241823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217326.

The product of its digits is 30720, while the sum is 34.

The spelling of 21524241823 in words is "twenty-one billion, five hundred twenty-four million, two hundred forty-one thousand, eight hundred twenty-three".