21924719287 has 8 divisors (see below), whose sum is σ = 22690790640. Its totient is φ = 21159317760.

The previous prime is 21924719251. The next prime is 21924719389. The reversal of 21924719287 is 78291742912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21924719287 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 (21924719587) 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, 100389 + ... + 232222.

It is an arithmetic number, because the mean of its divisors is an integer number (2836348830).

Almost surely, 2^21924719287 is an apocalyptic number.

21924719287 is a deficient number, since it is larger than the sum of its proper divisors (766071353).

21924719287 is a wasteful number, since it uses less digits than its factorization.

21924719287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334913.

The product of its digits is 1016064, while the sum is 52.

The spelling of 21924719287 in words is "twenty-one billion, nine hundred twenty-four million, seven hundred nineteen thousand, two hundred eighty-seven".