21733668387 has 16 divisors (see below), whose sum is σ = 33236674560. Its totient is φ = 14021721000.

The previous prime is 21733668373. The next prime is 21733668401. The reversal of 21733668387 is 78386633712.

21733668387 is a `hidden beast` number, since 2 + 173 + 36 + 68 + 387 = 666.

It is an interprime number because it is at equal distance from previous prime (21733668373) and next prime (21733668401).

It is not a de Polignac number, because 21733668387 - 2²⁴ = 21716891171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21733668347) 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 15 ways as a sum of consecutive naturals, for example, 12982239 + ... + 12983912.

It is an arithmetic number, because the mean of its divisors is an integer number (2077292160).

Almost surely, 2^21733668387 is an apocalyptic number.

21733668387 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21733668387 is a deficient number, since it is larger than the sum of its proper divisors (11503006173).

21733668387 is a wasteful number, since it uses less digits than its factorization.

21733668387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25966191 (or 25966185 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The spelling of 21733668387 in words is "twenty-one billion, seven hundred thirty-three million, six hundred sixty-eight thousand, three hundred eighty-seven".