21523432024 has 8 divisors (see below), whose sum is σ = 40356435060. Its totient is φ = 10761716008.

The previous prime is 21523432003. The next prime is 21523432027. The reversal of 21523432024 is 42023432512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21523431983 and 21523432001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523432027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345214494 + ... + 1345214509.

Almost surely, 2^21523432024 is an apocalyptic number.

It is an amenable number.

21523432024 is a deficient number, since it is larger than the sum of its proper divisors (18833003036).

21523432024 is a wasteful number, since it uses less digits than its factorization.

21523432024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690429009 (or 2690429005 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21523432024 its reverse (42023432512), we get a palindrome (63546864536).

The spelling of 21523432024 in words is "twenty-one billion, five hundred twenty-three million, four hundred thirty-two thousand, twenty-four".