21161746 has 8 divisors (see below), whose sum is σ = 31762224. Its totient is φ = 10574340.

The previous prime is 21161737. The next prime is 21161761. The reversal of 21161746 is 64716112.

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, 4141 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (3970278).

Almost surely, 2^21161746 is an apocalyptic number.

21161746 is a deficient number, since it is larger than the sum of its proper divisors (10600478).

21161746 is a wasteful number, since it uses less digits than its factorization.

21161746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536.

The product of its digits is 2016, while the sum is 28.

The square root of 21161746 is about 4600.1897786939. The cubic root of 21161746 is about 276.5989321450.

Adding to 21161746 its reverse (64716112), we get a palindrome (85877858).

The spelling of 21161746 in words is "twenty-one million, one hundred sixty-one thousand, seven hundred forty-six".