21335146 has 8 divisors (see below), whose sum is σ = 36574560. Its totient is φ = 9143628.

The previous prime is 21335143. The next prime is 21335173. The reversal of 21335146 is 64153312.

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 21335146.

It is not an unprimeable number, because it can be changed into a prime (21335141) 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, 761956 + ... + 761983.

It is an arithmetic number, because the mean of its divisors is an integer number (4571820).

Almost surely, 2^21335146 is an apocalyptic number.

21335146 is a deficient number, since it is larger than the sum of its proper divisors (15239414).

21335146 is a wasteful number, since it uses less digits than its factorization.

21335146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523948.

The product of its digits is 2160, while the sum is 25.

The square root of 21335146 is about 4618.9983762716. The cubic root of 21335146 is about 277.3523647232.

Adding to 21335146 its reverse (64153312), we get a palindrome (85488458).

The spelling of 21335146 in words is "twenty-one million, three hundred thirty-five thousand, one hundred forty-six".