21881343 has 8 divisors (see below), whose sum is σ = 31827456. Its totient is φ = 13261400.

The previous prime is 21881297. The next prime is 21881351. The reversal of 21881343 is 34318812.

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 21881343 - 2⁸ = 21881087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21881343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21881383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331503 + ... + 331568.

It is an arithmetic number, because the mean of its divisors is an integer number (3978432).

Almost surely, 2^21881343 is an apocalyptic number.

21881343 is a deficient number, since it is larger than the sum of its proper divisors (9946113).

21881343 is a wasteful number, since it uses less digits than its factorization.

21881343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663085.

The product of its digits is 4608, while the sum is 30.

The square root of 21881343 is about 4677.7497795414. The cubic root of 21881343 is about 279.6992646945.

The spelling of 21881343 in words is "twenty-one million, eight hundred eighty-one thousand, three hundred forty-three".