21045746 has 8 divisors (see below), whose sum is σ = 31745520. Its totient is φ = 10463908.

The previous prime is 21045737. The next prime is 21045757. The reversal of 21045746 is 64754012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29036 + ... + 29751.

It is an arithmetic number, because the mean of its divisors is an integer number (3968190).

Almost surely, 2^21045746 is an apocalyptic number.

21045746 is a deficient number, since it is larger than the sum of its proper divisors (10699774).

21045746 is a wasteful number, since it uses less digits than its factorization.

21045746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58968.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21045746 is about 4587.5642774788. The cubic root of 21045746 is about 276.0926052759.

Adding to 21045746 its reverse (64754012), we get a palindrome (85799758).

The spelling of 21045746 in words is "twenty-one million, forty-five thousand, seven hundred forty-six".