21074550 has 48 divisors (see below), whose sum is σ = 59734272. Its totient is φ = 4816800.

The previous prime is 21074527. The next prime is 21074569. The reversal of 21074550 is 5547012.

It is a self number, because there is not a number n which added to its sum of digits gives 21074550.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8986 + ... + 11085.

It is an arithmetic number, because the mean of its divisors is an integer number (1244464).

Almost surely, 2^21074550 is an apocalyptic number.

21074550 is an abundant number, since it is smaller than the sum of its proper divisors (38659722).

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

21074550 is a wasteful number, since it uses less digits than its factorization.

21074550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20093 (or 20088 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21074550 is about 4590.7025606110. The cubic root of 21074550 is about 276.2185047664.

The spelling of 21074550 in words is "twenty-one million, seventy-four thousand, five hundred fifty".