21271254 has 8 divisors (see below), whose sum is σ = 42542520. Its totient is φ = 7090416.

The previous prime is 21271253. The next prime is 21271259. The reversal of 21271254 is 45217212.

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

21271254 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271253) 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, 1772599 + ... + 1772610.

It is an arithmetic number, because the mean of its divisors is an integer number (5317815).

Almost surely, 2^21271254 is an apocalyptic number.

21271254 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21271254 is a wasteful number, since it uses less digits than its factorization.

21271254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545214.

The product of its digits is 1120, while the sum is 24.

The square root of 21271254 is about 4612.0769724713. The cubic root of 21271254 is about 277.0752270843.

Adding to 21271254 its reverse (45217212), we get a palindrome (66488466).

The spelling of 21271254 in words is "twenty-one million, two hundred seventy-one thousand, two hundred fifty-four".