21214336 has 128 divisors (see below), whose sum is σ = 53121600. Its totient is φ = 8294400.

The previous prime is 21214327. The next prime is 21214373. The reversal of 21214336 is 63341212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347746 + ... + 347806.

Almost surely, 2^21214336 is an apocalyptic number.

21214336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21214336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26560800).

21214336 is an abundant number, since it is smaller than the sum of its proper divisors (31907264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21214336 is a wasteful number, since it uses less digits than its factorization.

21214336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 106 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21214336 is about 4605.9023003099. The cubic root of 21214336 is about 276.8278720528.

Adding to 21214336 its reverse (63341212), we get a palindrome (84555548).

The spelling of 21214336 in words is "twenty-one million, two hundred fourteen thousand, three hundred thirty-six".