21055336 has 8 divisors (see below), whose sum is σ = 39478770. Its totient is φ = 10527664.

The previous prime is 21055319. The next prime is 21055343. The reversal of 21055336 is 63355012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 352836 = 4550^2 + 594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21055336.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315951 + ... + 1315966.

Almost surely, 2^21055336 is an apocalyptic number.

It is an amenable number.

21055336 is a deficient number, since it is larger than the sum of its proper divisors (18423434).

21055336 is a wasteful number, since it uses less digits than its factorization.

21055336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631923 (or 2631919 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 21055336 is about 4588.6093753990. The cubic root of 21055336 is about 276.1345349850.

The spelling of 21055336 in words is "twenty-one million, fifty-five thousand, three hundred thirty-six".