21524834 has 8 divisors (see below), whose sum is σ = 33986640. Its totient is φ = 10195956.

The previous prime is 21524831. The next prime is 21524903. The reversal of 21524834 is 43842512.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21524797 and 21524806.

It is not an unprimeable number, because it can be changed into a prime (21524831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283184 + ... + 283259.

It is an arithmetic number, because the mean of its divisors is an integer number (4248330).

Almost surely, 2^21524834 is an apocalyptic number.

21524834 is a deficient number, since it is larger than the sum of its proper divisors (12461806).

21524834 is a wasteful number, since it uses less digits than its factorization.

21524834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566464.

The product of its digits is 7680, while the sum is 29.

The square root of 21524834 is about 4639.4863939880. The cubic root of 21524834 is about 278.1719085800.

The spelling of 21524834 in words is "twenty-one million, five hundred twenty-four thousand, eight hundred thirty-four".