21343773 has 8 divisors (see below), whose sum is σ = 31045536. Its totient is φ = 12935600.

The previous prime is 21343771. The next prime is 21343787. The reversal of 21343773 is 37734312.

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

It is a cyclic number.

It is not a de Polignac number, because 21343773 - 2¹ = 21343771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21343773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323358 + ... + 323423.

It is an arithmetic number, because the mean of its divisors is an integer number (3880692).

Almost surely, 2^21343773 is an apocalyptic number.

It is an amenable number.

21343773 is a deficient number, since it is larger than the sum of its proper divisors (9701763).

21343773 is a wasteful number, since it uses less digits than its factorization.

21343773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646795.

The product of its digits is 10584, while the sum is 30.

The square root of 21343773 is about 4619.9321423588. The cubic root of 21343773 is about 277.3897427413.

The spelling of 21343773 in words is "twenty-one million, three hundred forty-three thousand, seven hundred seventy-three".