21111343 has 8 divisors (see below), whose sum is σ = 23095296. Its totient is φ = 19138200.

The previous prime is 21111301. The next prime is 21111373. The reversal of 21111343 is 34311112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111343 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 (21111373) 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, 1708 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (2886912).

Almost surely, 2^21111343 is an apocalyptic number.

21111343 is a deficient number, since it is larger than the sum of its proper divisors (1983953).

21111343 is a wasteful number, since it uses less digits than its factorization.

21111343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405.

The product of its digits is 72, while the sum is 16.

The square root of 21111343 is about 4594.7081517763. The cubic root of 21111343 is about 276.3791566565.

Adding to 21111343 its reverse (34311112), we get a palindrome (55422455).

It can be divided in two parts, 21 and 111343, that multiplied together give a triangular number (2338203 = T₂₁₆₂).

The spelling of 21111343 in words is "twenty-one million, one hundred eleven thousand, three hundred forty-three".