21016793 has 16 divisors (see below), whose sum is σ = 26160000. Its totient is φ = 16474752.

The previous prime is 21016763. The next prime is 21016799. The reversal of 21016793 is 39761012.

It is not a de Polignac number, because 21016793 - 2¹⁰ = 21015769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21016799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1133 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1635000).

Almost surely, 2^21016793 is an apocalyptic number.

It is an amenable number.

21016793 is a deficient number, since it is larger than the sum of its proper divisors (5143207).

21016793 is a wasteful number, since it uses less digits than its factorization.

21016793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21016793 is about 4584.4075953170. The cubic root of 21016793 is about 275.9659387008.

The spelling of 21016793 in words is "twenty-one million, sixteen thousand, seven hundred ninety-three".