21481834 has 8 divisors (see below), whose sum is σ = 35152128. Its totient is φ = 9764460.

The previous prime is 21481807. The next prime is 21481847. The reversal of 21481834 is 43818412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21481834² = 922938384007112, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21481796 and 21481805.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488202 + ... + 488245.

It is an arithmetic number, because the mean of its divisors is an integer number (4394016).

Almost surely, 2^21481834 is an apocalyptic number.

21481834 is a deficient number, since it is larger than the sum of its proper divisors (13670294).

21481834 is a wasteful number, since it uses less digits than its factorization.

21481834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976460.

The product of its digits is 6144, while the sum is 31.

The square root of 21481834 is about 4634.8499436336. The cubic root of 21481834 is about 277.9865511152.

The spelling of 21481834 in words is "twenty-one million, four hundred eighty-one thousand, eight hundred thirty-four".