21813850895 has 16 divisors (see below), whose sum is σ = 27111015360. Its totient is φ = 16829562624.

The previous prime is 21813850871. The next prime is 21813850897. The reversal of 21813850895 is 59805831812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21813850895 - 2²² = 21809656591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21813850897) 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 15 ways as a sum of consecutive naturals, for example, 36494 + ... + 212036.

It is an arithmetic number, because the mean of its divisors is an integer number (1694438460).

Almost surely, 2^21813850895 is an apocalyptic number.

21813850895 is a deficient number, since it is larger than the sum of its proper divisors (5297164465).

21813850895 is a wasteful number, since it uses less digits than its factorization.

21813850895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176434.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 21813850895 in words is "twenty-one billion, eight hundred thirteen million, eight hundred fifty thousand, eight hundred ninety-five".