21966574538 has 8 divisors (see below), whose sum is σ = 34684065120. Its totient is φ = 10405219500.

The previous prime is 21966574529. The next prime is 21966574571. The reversal of 21966574538 is 83547566912.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289033838 + ... + 289033913.

It is an arithmetic number, because the mean of its divisors is an integer number (4335508140).

Almost surely, 2^21966574538 is an apocalyptic number.

21966574538 is a deficient number, since it is larger than the sum of its proper divisors (12717490582).

21966574538 is a wasteful number, since it uses less digits than its factorization.

21966574538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578067772.

The product of its digits is 10886400, while the sum is 56.

The spelling of 21966574538 in words is "twenty-one billion, nine hundred sixty-six million, five hundred seventy-four thousand, five hundred thirty-eight".