21143522 has 8 divisors (see below), whose sum is σ = 31858176. Its totient is φ = 10524132.

The previous prime is 21143497. The next prime is 21143533. The reversal of 21143522 is 22534112.

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 = 21143494 and 21143503.

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, 23258 + ... + 24149.

It is an arithmetic number, because the mean of its divisors is an integer number (3982272).

Almost surely, 2^21143522 is an apocalyptic number.

21143522 is a deficient number, since it is larger than the sum of its proper divisors (10714654).

21143522 is a wasteful number, since it uses less digits than its factorization.

21143522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47632.

The product of its digits is 480, while the sum is 20.

The square root of 21143522 is about 4598.2085642128. The cubic root of 21143522 is about 276.5195091676.

Adding to 21143522 its reverse (22534112), we get a palindrome (43677634).

The spelling of 21143522 in words is "twenty-one million, one hundred forty-three thousand, five hundred twenty-two".