21243524534 has 8 divisors (see below), whose sum is σ = 31884453120. Its totient is φ = 10615373496.

The previous prime is 21243524527. The next prime is 21243524537. The reversal of 21243524534 is 43542534212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21243524494 and 21243524503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243524537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3190229 + ... + 3196880.

It is an arithmetic number, because the mean of its divisors is an integer number (3985556640).

Almost surely, 2^21243524534 is an apocalyptic number.

21243524534 is a deficient number, since it is larger than the sum of its proper divisors (10640928586).

21243524534 is a wasteful number, since it uses less digits than its factorization.

21243524534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388774.

The product of its digits is 115200, while the sum is 35.

The spelling of 21243524534 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred thirty-four".