21924856958369 has 4 divisors (see below), whose sum is σ = 21935935715760. Its totient is φ = 21913778200980.

The previous prime is 21924856958357. The next prime is 21924856958377. The reversal of 21924856958369 is 96385965842912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21924856958369 is a prime.

It is a super-2 number, since 2×21924856958369² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21924856958369.

It is not an unprimeable number, because it can be changed into a prime (21924856958399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5539375727 + ... + 5539379684.

It is an arithmetic number, because the mean of its divisors is an integer number (5483983928940).

Almost surely, 2^{21924856958369} is an apocalyptic number.

It is an amenable number.

21924856958369 is a deficient number, since it is larger than the sum of its proper divisors (11078757391).

21924856958369 is a wasteful number, since it uses less digits than its factorization.

21924856958369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11078757390.

The product of its digits is 2015539200, while the sum is 77.

The spelling of 21924856958369 in words is "twenty-one trillion, nine hundred twenty-four billion, eight hundred fifty-six million, nine hundred fifty-eight thousand, three hundred sixty-nine".