21042714 has 64 divisors (see below), whose sum is σ = 53932032. Its totient is φ = 5313600.

The previous prime is 21042689. The next prime is 21042731. The reversal of 21042714 is 41724012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16479 + ... + 17709.

It is an arithmetic number, because the mean of its divisors is an integer number (842688).

Almost surely, 2^21042714 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21042714, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26966016).

21042714 is an abundant number, since it is smaller than the sum of its proper divisors (32889318).

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

21042714 is a wasteful number, since it uses less digits than its factorization.

21042714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21042714 is about 4587.2338069909. The cubic root of 21042714 is about 276.0793460171.

Adding to 21042714 its reverse (41724012), we get a palindrome (62766726).

It can be divided in two parts, 210 and 42714, that added together give a palindrome (42924).

The spelling of 21042714 in words is "twenty-one million, forty-two thousand, seven hundred fourteen".