21095393 has 16 divisors (see below), whose sum is σ = 24192000. Its totient is φ = 18208080.

The previous prime is 21095381. The next prime is 21095401. The reversal of 21095393 is 39359012.

It is not a de Polignac number, because 21095393 - 2¹⁶ = 21029857 is a prime.

It is a super-3 number, since 3×21095393³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21095303) 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, 50138 + ... + 50556.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^21095393 is an apocalyptic number.

21095393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21095393 is a deficient number, since it is larger than the sum of its proper divisors (3096607).

21095393 is a wasteful number, since it uses less digits than its factorization.

21095393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 21095393 is about 4592.9721314199. The cubic root of 21095393 is about 276.3095359762.

The spelling of 21095393 in words is "twenty-one million, ninety-five thousand, three hundred ninety-three".