21288134 has 32 divisors (see below), whose sum is σ = 38019072. Its totient is φ = 8748000.

The previous prime is 21288119. The next prime is 21288161. The reversal of 21288134 is 43188212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21288097 and 21288106.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 78419 + ... + 78689.

It is an arithmetic number, because the mean of its divisors is an integer number (1188096).

Almost surely, 2^21288134 is an apocalyptic number.

21288134 is a deficient number, since it is larger than the sum of its proper divisors (16730938).

21288134 is a wasteful number, since it uses less digits than its factorization.

21288134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 3072, while the sum is 29.

The square root of 21288134 is about 4613.9065876977. The cubic root of 21288134 is about 277.1484995739.

The spelling of 21288134 in words is "twenty-one million, two hundred eighty-eight thousand, one hundred thirty-four".