21036574 has 16 divisors (see below), whose sum is σ = 34367760. Its totient is φ = 9599040.

The previous prime is 21036563. The next prime is 21036577. The reversal of 21036574 is 47563012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2232 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (2147985).

Almost surely, 2^21036574 is an apocalyptic number.

21036574 is a deficient number, since it is larger than the sum of its proper divisors (13331186).

21036574 is a wasteful number, since it uses less digits than its factorization.

21036574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9195.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21036574 is about 4586.5645095213. The cubic root of 21036574 is about 276.0524912415.

Adding to 21036574 its reverse (47563012), we get a palindrome (68599586).

The spelling of 21036574 in words is "twenty-one million, thirty-six thousand, five hundred seventy-four".