21834656 has 12 divisors (see below), whose sum is σ = 42987042. Its totient is φ = 10917312.

The previous prime is 21834641. The next prime is 21834671. The reversal of 21834656 is 65643812.

It is an interprime number because it is at equal distance from previous prime (21834641) and next prime (21834671).

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 2298256 = 4420^2 + 1516^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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, 341135 + ... + 341198.

Almost surely, 2^21834656 is an apocalyptic number.

It is an amenable number.

21834656 is a deficient number, since it is larger than the sum of its proper divisors (21152386).

21834656 is an equidigital number, since it uses as much as digits as its factorization.

21834656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682343 (or 682335 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21834656 is about 4672.7567880214. The cubic root of 21834656 is about 279.5001968118.

The spelling of 21834656 in words is "twenty-one million, eight hundred thirty-four thousand, six hundred fifty-six".