21334231 has 4 divisors (see below), whose sum is σ = 22022464. Its totient is φ = 20646000.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334231 is 13243312.

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

It is not a de Polignac number, because 21334231 - 2¹¹ = 21332183 is a prime.

It is a super-2 number, since 2×21334231² = 910298824722722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21334199 and 21334208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334241) 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, 344070 + ... + 344131.

It is an arithmetic number, because the mean of its divisors is an integer number (5505616).

Almost surely, 2^21334231 is an apocalyptic number.

21334231 is a deficient number, since it is larger than the sum of its proper divisors (688233).

21334231 is an equidigital number, since it uses as much as digits as its factorization.

21334231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688232.

The product of its digits is 432, while the sum is 19.

The square root of 21334231 is about 4618.8993277620. The cubic root of 21334231 is about 277.3483997313.

Adding to 21334231 its reverse (13243312), we get a palindrome (34577543).

The spelling of 21334231 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirty-one".