21440134 has 8 divisors (see below), whose sum is σ = 32640408. Its totient is φ = 10560000.

The previous prime is 21440129. The next prime is 21440137. The reversal of 21440134 is 43104412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440137) 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 3 ways as a sum of consecutive naturals, for example, 79867 + ... + 80134.

It is an arithmetic number, because the mean of its divisors is an integer number (4080051).

Almost surely, 2^21440134 is an apocalyptic number.

21440134 is a deficient number, since it is larger than the sum of its proper divisors (11200274).

21440134 is a wasteful number, since it uses less digits than its factorization.

21440134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160070.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21440134 is about 4630.3492308896. The cubic root of 21440134 is about 277.8065610826.

Adding to 21440134 its reverse (43104412), we get a palindrome (64544546).

The spelling of 21440134 in words is "twenty-one million, four hundred forty thousand, one hundred thirty-four".