21523514 has 8 divisors (see below), whose sum is σ = 32430720. Its totient is φ = 10713276.

The previous prime is 21523511. The next prime is 21523519. The reversal of 21523514 is 41532512.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21523514.

It is not an unprimeable number, because it can be changed into a prime (21523511) 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 in 3 ways as a sum of consecutive naturals, for example, 23684 + ... + 24575.

It is an arithmetic number, because the mean of its divisors is an integer number (4053840).

Almost surely, 2^21523514 is an apocalyptic number.

21523514 is a deficient number, since it is larger than the sum of its proper divisors (10907206).

21523514 is a wasteful number, since it uses less digits than its factorization.

21523514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48484.

The product of its digits is 1200, while the sum is 23.

The square root of 21523514 is about 4639.3441346811. The cubic root of 21523514 is about 278.1662222113.

The spelling of 21523514 in words is "twenty-one million, five hundred twenty-three thousand, five hundred fourteen".