21272343 has 8 divisors (see below), whose sum is σ = 29856000. Its totient is φ = 13435128.

The previous prime is 21272333. The next prime is 21272351. The reversal of 21272343 is 34327212.

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

It is not a de Polignac number, because 21272343 - 2⁴ = 21272327 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272323) 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, 186543 + ... + 186656.

It is an arithmetic number, because the mean of its divisors is an integer number (3732000).

Almost surely, 2^21272343 is an apocalyptic number.

21272343 is a deficient number, since it is larger than the sum of its proper divisors (8583657).

21272343 is a wasteful number, since it uses less digits than its factorization.

21272343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373221.

The product of its digits is 2016, while the sum is 24.

The square root of 21272343 is about 4612.1950305684. The cubic root of 21272343 is about 277.0799553712.

Adding to 21272343 its reverse (34327212), we get a palindrome (55599555).

The spelling of 21272343 in words is "twenty-one million, two hundred seventy-two thousand, three hundred forty-three".