21152343 has 4 divisors (see below), whose sum is σ = 28203128. Its totient is φ = 14101560.

The previous prime is 21152333. The next prime is 21152381. The reversal of 21152343 is 34325112.

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

It is not a de Polignac number, because 21152343 - 2⁵ = 21152311 is a prime.

It is a super-2 number, since 2×21152343² = 894843228779298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525388 + ... + 3525393.

It is an arithmetic number, because the mean of its divisors is an integer number (7050782).

Almost surely, 2^21152343 is an apocalyptic number.

21152343 is a deficient number, since it is larger than the sum of its proper divisors (7050785).

21152343 is an equidigital number, since it uses as much as digits as its factorization.

21152343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7050784.

The product of its digits is 720, while the sum is 21.

The square root of 21152343 is about 4599.1676420848. The cubic root of 21152343 is about 276.5579581303.

Adding to 21152343 its reverse (34325112), we get a palindrome (55477455).

The spelling of 21152343 in words is "twenty-one million, one hundred fifty-two thousand, three hundred forty-three".