21071060 has 24 divisors (see below), whose sum is σ = 44348136. Its totient is φ = 8409600.

The previous prime is 21071053. The next prime is 21071101. The reversal of 21071060 is 6017012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 839056 + 20232004 = 916^2 + 4498^2 .

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11144 + ... + 12896.

It is an arithmetic number, because the mean of its divisors is an integer number (1847839).

Almost surely, 2^21071060 is an apocalyptic number.

21071060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21071060 is an abundant number, since it is smaller than the sum of its proper divisors (23277076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21071060 is a wasteful number, since it uses less digits than its factorization.

21071060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21071060 is about 4590.3224287625. The cubic root of 21071060 is about 276.2032564250.

Adding to 21071060 its reverse (6017012), we get a palindrome (27088072).

The spelling of 21071060 in words is "twenty-one million, seventy-one thousand, sixty".