21541376 has 20 divisors (see below), whose sum is σ = 43041702. Its totient is φ = 10770432.

The previous prime is 21541361. The next prime is 21541379. The reversal of 21541376 is 67314512.

It can be written as a sum of positive squares in only one way, i.e., 21381376 + 160000 = 4624^2 + 400^2 .

It is not an unprimeable number, because it can be changed into a prime (21541379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20525 + ... + 21548.

Almost surely, 2^21541376 is an apocalyptic number.

It is an amenable number.

21541376 is a deficient number, since it is larger than the sum of its proper divisors (21500326).

21541376 is an frugal number, since it uses more digits than its factorization.

21541376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42091 (or 42075 counting only the distinct ones).

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

The square root of 21541376 is about 4641.2687920438. The cubic root of 21541376 is about 278.2431494151.

Adding to 21541376 its reverse (67314512), we get a palindrome (88855888).

The spelling of 21541376 in words is "twenty-one million, five hundred forty-one thousand, three hundred seventy-six".