21864432074 has 8 divisors (see below), whose sum is σ = 32797344960. Its totient is φ = 10931983756.

The previous prime is 21864432059. The next prime is 21864432131. The reversal of 21864432074 is 47023446812.

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

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, 47807 + ... + 214509.

It is an arithmetic number, because the mean of its divisors is an integer number (4099668120).

Almost surely, 2^21864432074 is an apocalyptic number.

21864432074 is a deficient number, since it is larger than the sum of its proper divisors (10932912886).

21864432074 is a wasteful number, since it uses less digits than its factorization.

21864432074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232284.

The product of its (nonzero) digits is 258048, while the sum is 41.

Adding to 21864432074 its reverse (47023446812), we get a palindrome (68887878886).

The spelling of 21864432074 in words is "twenty-one billion, eight hundred sixty-four million, four hundred thirty-two thousand, seventy-four".