21110747 has 8 divisors (see below), whose sum is σ = 24220416. Its totient is φ = 18024552.

The previous prime is 21110737. The next prime is 21110813. The reversal of 21110747 is 74701112.

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

It is not a de Polignac number, because 21110747 - 2²⁴ = 4333531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3893 + ... + 7574.

It is an arithmetic number, because the mean of its divisors is an integer number (3027552).

Almost surely, 2^21110747 is an apocalyptic number.

21110747 is a deficient number, since it is larger than the sum of its proper divisors (3109669).

21110747 is a wasteful number, since it uses less digits than its factorization.

21110747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11737.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 21110747 is about 4594.6432940980. The cubic root of 21110747 is about 276.3765557873.

Adding to 21110747 its reverse (74701112), we get a palindrome (95811859).

The spelling of 21110747 in words is "twenty-one million, one hundred ten thousand, seven hundred forty-seven".