21271354 has 32 divisors (see below), whose sum is σ = 35642880. Its totient is φ = 9515376.

The previous prime is 21271351. The next prime is 21271379. The reversal of 21271354 is 45317212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21271351) 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 15 ways as a sum of consecutive naturals, for example, 206467 + ... + 206569.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^21271354 is an apocalyptic number.

21271354 is a deficient number, since it is larger than the sum of its proper divisors (14371526).

21271354 is a wasteful number, since it uses less digits than its factorization.

21271354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 165 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 21271354 is about 4612.0878135612. The cubic root of 21271354 is about 277.0756612771.

Adding to 21271354 its reverse (45317212), we get a palindrome (66588566).

It can be divided in two parts, 2127 and 1354, that added together give a square (3481 = 59²).

The spelling of 21271354 in words is "twenty-one million, two hundred seventy-one thousand, three hundred fifty-four".