21451376 has 20 divisors (see below), whose sum is σ = 41662512. Its totient is φ = 10699776.

The previous prime is 21451373. The next prime is 21451427. The reversal of 21451376 is 67315412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21451373) 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, 6416 + ... + 9168.

Almost surely, 2^21451376 is an apocalyptic number.

It is an amenable number.

21451376 is a deficient number, since it is larger than the sum of its proper divisors (20211136).

21451376 is a wasteful number, since it uses less digits than its factorization.

21451376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3248 (or 3242 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 21451376 is about 4631.5630191114. The cubic root of 21451376 is about 277.8551079753.

Adding to 21451376 its reverse (67315412), we get a palindrome (88766788).

The spelling of 21451376 in words is "twenty-one million, four hundred fifty-one thousand, three hundred seventy-six".