21336146 has 16 divisors (see below), whose sum is σ = 34884864. Its totient is φ = 9727824.

The previous prime is 21336137. The next prime is 21336151. The reversal of 21336146 is 64163312.

It is a super-3 number, since 3×21336146³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2786 + ... + 7101.

It is an arithmetic number, because the mean of its divisors is an integer number (2180304).

Almost surely, 2^21336146 is an apocalyptic number.

21336146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21336146 is a deficient number, since it is larger than the sum of its proper divisors (13548718).

21336146 is a wasteful number, since it uses less digits than its factorization.

21336146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985.

The product of its digits is 2592, while the sum is 26.

The square root of 21336146 is about 4619.1066235799. The cubic root of 21336146 is about 277.3566979180.

Adding to 21336146 its reverse (64163312), we get a palindrome (85499458).

The spelling of 21336146 in words is "twenty-one million, three hundred thirty-six thousand, one hundred forty-six".