21035764 has 12 divisors (see below), whose sum is σ = 36892800. Its totient is φ = 10494968.

The previous prime is 21035761. The next prime is 21035771. The reversal of 21035764 is 46753012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035761) 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 3 ways as a sum of consecutive naturals, for example, 3574 + ... + 7405.

It is an arithmetic number, because the mean of its divisors is an integer number (3074400).

Almost surely, 2^21035764 is an apocalyptic number.

It is an amenable number.

21035764 is a deficient number, since it is larger than the sum of its proper divisors (15857036).

21035764 is a wasteful number, since it uses less digits than its factorization.

21035764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11462 (or 11460 counting only the distinct ones).

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

The square root of 21035764 is about 4586.4762072859. The cubic root of 21035764 is about 276.0489481204.

Adding to 21035764 its reverse (46753012), we get a palindrome (67788776).

The spelling of 21035764 in words is "twenty-one million, thirty-five thousand, seven hundred sixty-four".