21754134 has 24 divisors (see below), whose sum is σ = 47705112. Its totient is φ = 7163520.

The previous prime is 21754121. The next prime is 21754141. The reversal of 21754134 is 43145712.

It is a junction number, because it is equal to n+sod(n) for n = 21754098 and 21754107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5787 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (1987713).

Almost surely, 2^21754134 is an apocalyptic number.

21754134 is an abundant number, since it is smaller than the sum of its proper divisors (25950978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21754134 is a wasteful number, since it uses less digits than its factorization.

21754134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14652 (or 14649 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21754134 is about 4664.1327168081. The cubic root of 21754134 is about 279.1561926518.

Adding to 21754134 its reverse (43145712), we get a palindrome (64899846).

The spelling of 21754134 in words is "twenty-one million, seven hundred fifty-four thousand, one hundred thirty-four".