21150343 has 4 divisors (see below), whose sum is σ = 21311928. Its totient is φ = 20988760.

The previous prime is 21150331. The next prime is 21150377. The reversal of 21150343 is 34305112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21150343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21150343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80596 + ... + 80857.

It is an arithmetic number, because the mean of its divisors is an integer number (5327982).

Almost surely, 2^21150343 is an apocalyptic number.

21150343 is a deficient number, since it is larger than the sum of its proper divisors (161585).

21150343 is a wasteful number, since it uses less digits than its factorization.

21150343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161584.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21150343 is about 4598.9502062971. The cubic root of 21150343 is about 276.5492414702.

Adding to 21150343 its reverse (34305112), we get a palindrome (55455455).

The spelling of 21150343 in words is "twenty-one million, one hundred fifty thousand, three hundred forty-three".