21451334 has 4 divisors (see below), whose sum is σ = 32177004. Its totient is φ = 10725666.

The previous prime is 21451319. The next prime is 21451343. The reversal of 21451334 is 43315412.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 5362832 + ... + 5362835.

It is an arithmetic number, because the mean of its divisors is an integer number (8044251).

Almost surely, 2^21451334 is an apocalyptic number.

21451334 is a deficient number, since it is larger than the sum of its proper divisors (10725670).

21451334 is a wasteful number, since it uses less digits than its factorization.

21451334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10725669.

The product of its digits is 1440, while the sum is 23.

The square root of 21451334 is about 4631.5584850026. The cubic root of 21451334 is about 277.8549266362.

Adding to 21451334 its reverse (43315412), we get a palindrome (64766746).

The spelling of 21451334 in words is "twenty-one million, four hundred fifty-one thousand, three hundred thirty-four".