21225343 has 8 divisors (see below), whose sum is σ = 22399200. Its totient is φ = 20072448.

The previous prime is 21225329. The next prime is 21225349. The reversal of 21225343 is 34352212.

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 21225343 - 2⁵ = 21225311 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 (21225349) 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, 3138 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (2799900).

Almost surely, 2^21225343 is an apocalyptic number.

21225343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21225343 is a deficient number, since it is larger than the sum of its proper divisors (1173857).

21225343 is a wasteful number, since it uses less digits than its factorization.

21225343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10481.

The product of its digits is 1440, while the sum is 22.

The square root of 21225343 is about 4607.0970252427. The cubic root of 21225343 is about 276.8757409020.

Adding to 21225343 its reverse (34352212), we get a palindrome (55577555).

The spelling of 21225343 in words is "twenty-one million, two hundred twenty-five thousand, three hundred forty-three".