21165424534 has 8 divisors (see below), whose sum is σ = 31748839488. Its totient is φ = 10582478040.

The previous prime is 21165424519. The next prime is 21165424543. The reversal of 21165424534 is 43542456112.

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 = 21165424493 and 21165424502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35739 + ... + 208825.

It is an arithmetic number, because the mean of its divisors is an integer number (3968604936).

Almost surely, 2^21165424534 is an apocalyptic number.

21165424534 is a deficient number, since it is larger than the sum of its proper divisors (10583414954).

21165424534 is a wasteful number, since it uses less digits than its factorization.

21165424534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234230.

The product of its digits is 115200, while the sum is 37.

The spelling of 21165424534 in words is "twenty-one billion, one hundred sixty-five million, four hundred twenty-four thousand, five hundred thirty-four".