21254711 has 8 divisors (see below), whose sum is σ = 22513920. Its totient is φ = 20009592.

The previous prime is 21254707. The next prime is 21254729. The reversal of 21254711 is 11745212.

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

It is a cyclic number.

It is not a de Polignac number, because 21254711 - 2² = 21254707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254411) 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 7 ways as a sum of consecutive naturals, for example, 335 + ... + 6528.

It is an arithmetic number, because the mean of its divisors is an integer number (2814240).

Almost surely, 2^21254711 is an apocalyptic number.

21254711 is a deficient number, since it is larger than the sum of its proper divisors (1259209).

21254711 is a wasteful number, since it uses less digits than its factorization.

21254711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7045.

The product of its digits is 560, while the sum is 23.

The square root of 21254711 is about 4610.2831800227. The cubic root of 21254711 is about 277.0033798195.

Adding to 21254711 its reverse (11745212), we get a palindrome (32999923).

The spelling of 21254711 in words is "twenty-one million, two hundred fifty-four thousand, seven hundred eleven".