21983818393 has 8 divisors (see below), whose sum is σ = 22994395200. Its totient is φ = 20977804848.

The previous prime is 21983818357. The next prime is 21983818411. The reversal of 21983818393 is 39381838912.

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 21983818393 - 2¹³ = 21983810201 is a prime.

It is a super-3 number, since 3×21983818393³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21983818093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130958 + ... + 1150231.

It is an arithmetic number, because the mean of its divisors is an integer number (2874299400).

Almost surely, 2^21983818393 is an apocalyptic number.

21983818393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21983818393 is a deficient number, since it is larger than the sum of its proper divisors (1010576807).

21983818393 is a wasteful number, since it uses less digits than its factorization.

21983818393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281631.

The product of its digits is 2239488, while the sum is 55.

The spelling of 21983818393 in words is "twenty-one billion, nine hundred eighty-three million, eight hundred eighteen thousand, three hundred ninety-three".