21334351 has 4 divisors (see below), whose sum is σ = 21404152. Its totient is φ = 21264552.

The previous prime is 21334333. The next prime is 21334373. The reversal of 21334351 is 15343312.

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 21334351 - 2⁵ = 21334319 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 (21334451) 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, 34440 + ... + 35053.

It is an arithmetic number, because the mean of its divisors is an integer number (5351038).

Almost surely, 2^21334351 is an apocalyptic number.

21334351 is a deficient number, since it is larger than the sum of its proper divisors (69801).

21334351 is an equidigital number, since it uses as much as digits as its factorization.

21334351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69800.

The product of its digits is 1080, while the sum is 22.

The square root of 21334351 is about 4618.9123178515. The cubic root of 21334351 is about 277.3489197367.

Adding to 21334351 its reverse (15343312), we get a palindrome (36677663).

The spelling of 21334351 in words is "twenty-one million, three hundred thirty-four thousand, three hundred fifty-one".