21541082 has 4 divisors (see below), whose sum is σ = 32311626. Its totient is φ = 10770540.

The previous prime is 21541061. The next prime is 21541097. The reversal of 21541082 is 28014512.

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

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 5851561 = 3961^2 + 2419^2 .

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, 5385269 + ... + 5385272.

Almost surely, 2^21541082 is an apocalyptic number.

21541082 is a deficient number, since it is larger than the sum of its proper divisors (10770544).

21541082 is a wasteful number, since it uses less digits than its factorization.

21541082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10770543.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21541082 is about 4641.2371195620. The cubic root of 21541082 is about 278.2418835742.

Adding to 21541082 its reverse (28014512), we get a palindrome (49555594).

The spelling of 21541082 in words is "twenty-one million, five hundred forty-one thousand, eighty-two".