21116770 has 8 divisors (see below), whose sum is σ = 38010204. Its totient is φ = 8446704.

The previous prime is 21116761. The next prime is 21116773. The reversal of 21116770 is 7761112.

It can be written as a sum of positive squares in 2 ways, for example, as 20439441 + 677329 = 4521^2 + 823^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21116773) 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, 1055829 + ... + 1055848.

Almost surely, 2^21116770 is an apocalyptic number.

21116770 is a deficient number, since it is larger than the sum of its proper divisors (16893434).

21116770 is a wasteful number, since it uses less digits than its factorization.

21116770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111684.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 21116770 is about 4595.2986845253. The cubic root of 21116770 is about 276.4028371518.

Adding to 21116770 its reverse (7761112), we get a palindrome (28877882).

The spelling of 21116770 in words is "twenty-one million, one hundred sixteen thousand, seven hundred seventy".