21193293 has 16 divisors (see below), whose sum is σ = 30908736. Its totient is φ = 12810240.

The previous prime is 21193283. The next prime is 21193307. The reversal of 21193293 is 39239112.

It is a happy number.

It is not a de Polignac number, because 21193293 - 2¹⁸ = 20931149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21193293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21193223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17805 + ... + 18957.

It is an arithmetic number, because the mean of its divisors is an integer number (1931796).

Almost surely, 2^21193293 is an apocalyptic number.

It is an amenable number.

21193293 is a deficient number, since it is larger than the sum of its proper divisors (9715443).

21193293 is a wasteful number, since it uses less digits than its factorization.

21193293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724.

The product of its digits is 2916, while the sum is 30.

The square root of 21193293 is about 4603.6173820160. The cubic root of 21193293 is about 276.7363110748.

The spelling of 21193293 in words is "twenty-one million, one hundred ninety-three thousand, two hundred ninety-three".