21933340391 has 8 divisors (see below), whose sum is σ = 22034316480. Its totient is φ = 21832409952.

The previous prime is 21933340357. The next prime is 21933340393. The reversal of 21933340391 is 19304333912.

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

It is a cyclic number.

It is not a de Polignac number, because 21933340391 - 2¹⁰ = 21933339367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21933340393) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1286066 + ... + 1303008.

It is an arithmetic number, because the mean of its divisors is an integer number (2754289560).

Almost surely, 2^21933340391 is an apocalyptic number.

21933340391 is a deficient number, since it is larger than the sum of its proper divisors (100976089).

21933340391 is a wasteful number, since it uses less digits than its factorization.

21933340391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22825.

The product of its (nonzero) digits is 52488, while the sum is 38.

The spelling of 21933340391 in words is "twenty-one billion, nine hundred thirty-three million, three hundred forty thousand, three hundred ninety-one".