21923809193 has 8 divisors (see below), whose sum is σ = 25756643136. Its totient is φ = 18397602000.

The previous prime is 21923809123. The next prime is 21923809207. The reversal of 21923809193 is 39190832912.

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 21923809193 - 2⁸ = 21923808937 is a prime.

It is a super-2 number, since 2×21923809193² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21923809123) 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, 76656533 + ... + 76656818.

It is an arithmetic number, because the mean of its divisors is an integer number (3219580392).

Almost surely, 2^21923809193 is an apocalyptic number.

It is an amenable number.

21923809193 is a deficient number, since it is larger than the sum of its proper divisors (3832833943).

21923809193 is a wasteful number, since it uses less digits than its factorization.

21923809193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153313375.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 21923809193 in words is "twenty-one billion, nine hundred twenty-three million, eight hundred nine thousand, one hundred ninety-three".