21571082 has 8 divisors (see below), whose sum is σ = 34845636. Its totient is φ = 9955872.

The previous prime is 21571057. The next prime is 21571087. The reversal of 21571082 is 28017512.

It can be written as a sum of positive squares in 2 ways, for example, as 16638241 + 4932841 = 4079^2 + 2221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 829657 = 21571082 / (2 + 1 + 5 + 7 + 1 + 0 + 8 + 2).

It is not an unprimeable number, because it can be changed into a prime (21571087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414803 + ... + 414854.

Almost surely, 2^21571082 is an apocalyptic number.

21571082 is a deficient number, since it is larger than the sum of its proper divisors (13274554).

21571082 is a wasteful number, since it uses less digits than its factorization.

21571082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829672.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21571082 is about 4644.4678920195. The cubic root of 21571082 is about 278.3709916736.

Adding to 21571082 its reverse (28017512), we get a palindrome (49588594).

The spelling of 21571082 in words is "twenty-one million, five hundred seventy-one thousand, eighty-two".