21834311 has 4 divisors (see below), whose sum is σ = 21981000. Its totient is φ = 21687624.

The previous prime is 21834277. The next prime is 21834331. The reversal of 21834311 is 11343812.

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-21834311 is a prime.

It is a super-3 number, since 3×21834311³ (a number of 23 digits) contains 333 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 (21834331) 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, 73121 + ... + 73418.

It is an arithmetic number, because the mean of its divisors is an integer number (5495250).

Almost surely, 2^21834311 is an apocalyptic number.

21834311 is a deficient number, since it is larger than the sum of its proper divisors (146689).

21834311 is a wasteful number, since it uses less digits than its factorization.

21834311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146688.

The product of its digits is 576, while the sum is 23.

The square root of 21834311 is about 4672.7198717663. The cubic root of 21834311 is about 279.4987247166.

The spelling of 21834311 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred eleven".