21856907433 has 8 divisors (see below), whose sum is σ = 29577506848. Its totient is φ = 14353789824.

The previous prime is 21856907419. The next prime is 21856907489. The reversal of 21856907433 is 33470965812.

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

It is not a de Polignac number, because 21856907433 - 2¹² = 21856903337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21856907333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54370216 + ... + 54370617.

It is an arithmetic number, because the mean of its divisors is an integer number (3697188356).

It is a 1-persistent number, because it is pandigital, but 2⋅21856907433 = 43713814866 is not.

Almost surely, 2^21856907433 is an apocalyptic number.

It is an amenable number.

21856907433 is a deficient number, since it is larger than the sum of its proper divisors (7720599415).

21856907433 is a wasteful number, since it uses less digits than its factorization.

21856907433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108740903.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 21856907433 in words is "twenty-one billion, eight hundred fifty-six million, nine hundred seven thousand, four hundred thirty-three".