21161170 has 8 divisors (see below), whose sum is σ = 38090124. Its totient is φ = 8464464.

The previous prime is 21161137. The next prime is 21161191. The reversal of 21161170 is 7116112.

It can be written as a sum of positive squares in 2 ways, for example, as 18481401 + 2679769 = 4299^2 + 1637^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 1058049 + ... + 1058068.

Almost surely, 2^21161170 is an apocalyptic number.

21161170 is a deficient number, since it is larger than the sum of its proper divisors (16928954).

21161170 is a wasteful number, since it uses less digits than its factorization.

21161170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116124.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 21161170 is about 4600.1271721551. The cubic root of 21161170 is about 276.5964225469.

Adding to 21161170 its reverse (7116112), we get a palindrome (28277282).

The spelling of 21161170 in words is "twenty-one million, one hundred sixty-one thousand, one hundred seventy".