21343071 has 4 divisors (see below), whose sum is σ = 28457432. Its totient is φ = 14228712.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343071 is 17034312.

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

It is not a de Polignac number, because 21343071 - 2⁵ = 21343039 is a prime.

It is a super-2 number, since 2×21343071² = 911053359422082, 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 (21343771) 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, 3557176 + ... + 3557181.

It is an arithmetic number, because the mean of its divisors is an integer number (7114358).

Almost surely, 2^21343071 is an apocalyptic number.

21343071 is a deficient number, since it is larger than the sum of its proper divisors (7114361).

21343071 is an equidigital number, since it uses as much as digits as its factorization.

21343071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114360.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21343071 is about 4619.8561665922. The cubic root of 21343071 is about 277.3867015774.

Adding to 21343071 its reverse (17034312), we get a palindrome (38377383).

The spelling of 21343071 in words is "twenty-one million, three hundred forty-three thousand, seventy-one".