21342111 has 32 divisors (see below), whose sum is σ = 34675200. Its totient is φ = 11404800.

The previous prime is 21342071. The next prime is 21342119. The reversal of 21342111 is 11124312.

It is not a de Polignac number, because 21342111 - 2⁶ = 21342047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35211 + ... + 35811.

It is an arithmetic number, because the mean of its divisors is an integer number (1083600).

Almost surely, 2^21342111 is an apocalyptic number.

21342111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21342111 is a deficient number, since it is larger than the sum of its proper divisors (13333089).

21342111 is a wasteful number, since it uses less digits than its factorization.

21342111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719.

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

The square root of 21342111 is about 4619.7522660853. The cubic root of 21342111 is about 277.3825426129.

Adding to 21342111 its reverse (11124312), we get a palindrome (32466423).

It can be divided in two parts, 213 and 42111, that added together give a palindrome (42324).

The spelling of 21342111 in words is "twenty-one million, three hundred forty-two thousand, one hundred eleven".