21693943067 has 4 divisors (see below), whose sum is σ = 21750585600. Its totient is φ = 21637300536.

The previous prime is 21693943027. The next prime is 21693943069. The reversal of 21693943067 is 76034939612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21693943067 - 2¹⁸ = 21693680923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21693943069) 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 3 ways as a sum of consecutive naturals, for example, 28320692 + ... + 28321457.

It is an arithmetic number, because the mean of its divisors is an integer number (5437646400).

Almost surely, 2^21693943067 is an apocalyptic number.

21693943067 is a deficient number, since it is larger than the sum of its proper divisors (56642533).

21693943067 is an equidigital number, since it uses as much as digits as its factorization.

21693943067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56642532.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The spelling of 21693943067 in words is "twenty-one billion, six hundred ninety-three million, nine hundred forty-three thousand, sixty-seven".