21969343 has 4 divisors (see below), whose sum is σ = 23966568. Its totient is φ = 19972120.

The previous prime is 21969331. The next prime is 21969371. The reversal of 21969343 is 34396912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21969343 - 2¹³ = 21961151 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 (21969313) 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 3 ways as a sum of consecutive naturals, for example, 998596 + ... + 998617.

It is an arithmetic number, because the mean of its divisors is an integer number (5991642).

Almost surely, 2^21969343 is an apocalyptic number.

21969343 is a deficient number, since it is larger than the sum of its proper divisors (1997225).

21969343 is a wasteful number, since it uses less digits than its factorization.

21969343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997224.

The product of its digits is 34992, while the sum is 37.

The square root of 21969343 is about 4687.1465733429. The cubic root of 21969343 is about 280.0737178349.

The spelling of 21969343 in words is "twenty-one million, nine hundred sixty-nine thousand, three hundred forty-three".