21853929105 has 192 divisors, whose sum is σ = 42958356480. Its totient is φ = 10230105600.

The previous prime is 21853929103. The next prime is 21853929151. The reversal of 21853929105 is 50192935812.

21853929105 is a `hidden beast` number, since 2 + 1 + 8 + 539 + 2 + 9 + 105 = 666.

It is not a de Polignac number, because 21853929105 - 2¹ = 21853929103 is a prime.

It is a super-2 number, since 2×21853929105² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21853929103) 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 191 ways as a sum of consecutive naturals, for example, 66023790 + ... + 66024120.

It is an arithmetic number, because the mean of its divisors is an integer number (223741440).

Almost surely, 2^21853929105 is an apocalyptic number.

It is an amenable number.

21853929105 is a deficient number, since it is larger than the sum of its proper divisors (21104427375).

21853929105 is a wasteful number, since it uses less digits than its factorization.

21853929105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 21853929105 in words is "twenty-one billion, eight hundred fifty-three million, nine hundred twenty-nine thousand, one hundred five".