21049364 has 12 divisors (see below), whose sum is σ = 42098784. Its totient is φ = 9021144.

The previous prime is 21049363. The next prime is 21049387. The reversal of 21049364 is 46394012.

21049364 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21049363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375854 + ... + 375909.

It is an arithmetic number, because the mean of its divisors is an integer number (3508232).

Almost surely, 2^21049364 is an apocalyptic number.

It is an amenable number.

21049364 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21049364 is a wasteful number, since it uses less digits than its factorization.

21049364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751774 (or 751772 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21049364 is about 4587.9585874330. The cubic root of 21049364 is about 276.1084255088.

The spelling of 21049364 in words is "twenty-one million, forty-nine thousand, three hundred sixty-four".