21234111 has 8 divisors (see below), whose sum is σ = 28423344. Its totient is φ = 14100480.

The previous prime is 21234097. The next prime is 21234113. The reversal of 21234111 is 11143212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21234111 - 2⁷ = 21233983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234113) 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 7 ways as a sum of consecutive naturals, for example, 13000 + ... + 14541.

It is an arithmetic number, because the mean of its divisors is an integer number (3552918).

Almost surely, 2^21234111 is an apocalyptic number.

21234111 is a deficient number, since it is larger than the sum of its proper divisors (7189233).

21234111 is a wasteful number, since it uses less digits than its factorization.

21234111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27801.

The product of its digits is 48, while the sum is 15.

The square root of 21234111 is about 4608.0485023489. The cubic root of 21234111 is about 276.9138606204.

Adding to 21234111 its reverse (11143212), we get a palindrome (32377323).

The spelling of 21234111 in words is "twenty-one million, two hundred thirty-four thousand, one hundred eleven".