21035746 has 4 divisors (see below), whose sum is σ = 31553622. Its totient is φ = 10517872.

The previous prime is 21035737. The next prime is 21035761. The reversal of 21035746 is 64753012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 6890625 = 3761^2 + 2625^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5258935 + ... + 5258938.

Almost surely, 2^21035746 is an apocalyptic number.

21035746 is a deficient number, since it is larger than the sum of its proper divisors (10517876).

21035746 is a wasteful number, since it uses less digits than its factorization.

21035746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10517875.

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

The square root of 21035746 is about 4586.4742449947. The cubic root of 21035746 is about 276.0488693834.

Adding to 21035746 its reverse (64753012), we get a palindrome (85788758).

The spelling of 21035746 in words is "twenty-one million, thirty-five thousand, seven hundred forty-six".