21053343 has 8 divisors (see below), whose sum is σ = 28490368. Its totient is φ = 13825944.

The previous prime is 21053323. The next prime is 21053353. The reversal of 21053343 is 34335012.

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

It is not a de Polignac number, because 21053343 - 2¹³ = 21045151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053323) 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, 52171 + ... + 52572.

It is an arithmetic number, because the mean of its divisors is an integer number (3561296).

Almost surely, 2^21053343 is an apocalyptic number.

21053343 is a deficient number, since it is larger than the sum of its proper divisors (7437025).

21053343 is a wasteful number, since it uses less digits than its factorization.

21053343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104813.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 21053343 is about 4588.3922020682. The cubic root of 21053343 is about 276.1258221739.

Adding to 21053343 its reverse (34335012), we get a palindrome (55388355).

The spelling of 21053343 in words is "twenty-one million, fifty-three thousand, three hundred forty-three".