21834518656 has 16 divisors (see below), whose sum is σ = 43498455390. Its totient is φ = 10917259264.

The previous prime is 21834518639. The next prime is 21834518659. The reversal of 21834518656 is 65681543812.

It can be written as a sum of positive squares in only one way, i.e., 17270165056 + 4564353600 = 131416^2 + 67560^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-3 number, since 3×21834518656³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21834518659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85290961 + ... + 85291216.

Almost surely, 2^21834518656 is an apocalyptic number.

It is an amenable number.

21834518656 is a deficient number, since it is larger than the sum of its proper divisors (21663936734).

21834518656 is an equidigital number, since it uses as much as digits as its factorization.

21834518656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170582191 (or 170582179 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

The spelling of 21834518656 in words is "twenty-one billion, eight hundred thirty-four million, five hundred eighteen thousand, six hundred fifty-six".